diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6e289d1..45e7569d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 ### Added
 - Abbreviations `\T`, `\mT`, `\uT` (see issue
   [\#670](https://github.com/josephwright/siunitx/issues/670))
+- Option `range-open-phrase`
 - Option `round-direction` to allow 'truncation' of rounded
   values (see issue
   [\#664](https://github.com/josephwright/siunitx/issues/664))
diff --git a/siunitx-compound.dtx b/siunitx-compound.dtx
index 844389fd..7e97ea99 100644
--- a/siunitx-compound.dtx
+++ b/siunitx-compound.dtx
@@ -137,6 +137,25 @@
 %   Phrase (or similar) used between limits of a range.
 % \end{variable}
 %
+% \begin{function}{compound-boundary-mode}
+%   \begin{syntax}
+%     |compound-boundary-mode| = |number|\verb"|"|text|
+%   \end{syntax}
+%   Choice which determines whether the material at the start and
+%   end of a compound quantity are typeset a |number| or as |text|;
+%   the latter is the standard setting.
+% \end{function}
+%
+% \begin{function}{compound-close-boundary, compound-open-boundary}
+%   \begin{syntax}
+%     |compound-close-boundary| = \meta{tokens}\\
+%     |compound-open-boundary|  = \meta{tokens}
+%   \end{syntax}
+%   Literals which are inserted at the opening and closing boundary of a compound
+%   quantity; they are not used when the number of items is one.
+%   The standard settings set these empty.
+% \end{function}
+%
 % \begin{function}{compound-exponents}
 %   \begin{syntax}
 %     |compound-exponents| = |combine|\verb"|"|combine-bracket|\verb"|"|individual|
@@ -236,10 +255,22 @@
 %   \end{syntax}
 % \end{function}
 %
+% \begin{function}{range-open-phrase}
+%   \begin{syntax}
+%     |range-open-phrase| = \meta{text}
+%   \end{syntax}
+%   Literal containing the material to be inserted at the start of a range.
+%   The standard setting is empty.
+% \end{function}
+%
 % \begin{function}{range-phrase}
 %   \begin{syntax}
 %     |range-phrase| = \meta{text}
 %   \end{syntax}
+%   Literal containing the material to be inserted between the start and end
+%   of a range. The standard setting contains the word \texttt{to} inside the
+%   \cs{text} command, along with appropriate spacing commands to allow this
+%   material to work in both math and text typesetting modes.
 % \end{function}
 %
 % \begin{function}{range-units}
@@ -333,8 +364,10 @@
 %
 % \begin{variable}
 %   {
+%     \l_@@_boundary_close_tl   ,
 %     \l_@@_separator_final_tl  ,
 %     \l_@@_separator_pair_tl   ,
+%     \l_@@_boundary_open_tl    ,
 %     \l_@@_separator_tl        ,
 %     \l_@@_separator_text_bool ,
 %     \l_@@_exp_bracket_bool    ,
@@ -344,6 +377,7 @@
 %   }
 %   List options.
 %    \begin{macrocode}
+\bool_new:N \l_@@_boundary_text_bool
 \bool_new:N \l_@@_exp_bracket_bool
 \bool_new:N \l_@@_exp_combine_bool
 \bool_new:N \l_@@_separator_text_bool
@@ -352,6 +386,13 @@
 \bool_new:N \l_@@_unit_repeat_bool
 \keys_define:nn { siunitx }
   {
+    compound-boundary-mode .choice: ,
+    compound-boundary-mode / number .code:n =
+      { \bool_set_false:N \l_@@_delim_text_bool } ,
+    compound-boundary-mode / text .code:n =
+      { \bool_set_true:N \l_@@_delim_text_bool } ,
+    compound-close-boundary .tl_set:N =
+      \l_@@_boundary_close_tl ,
     compound-exponents .choice: ,
     compound-exponents / combine .code:n =
       {
@@ -372,6 +413,8 @@
       \l_@@_separator_final_tl ,
     compound-pair-separator .tl_set:N =
       \l_@@_separator_pair_tl ,
+    compound-open-boundary .tl_set:N =
+      \l_@@_boundary_open_tl ,
     compound-separator .tl_set:N =
       \l_@@_separator_tl ,
     compound-separator-mode .choice: ,
@@ -715,7 +758,11 @@
 % \begin{macro}{\@@_print_aux:n}
 % \begin{macro}{\@@_print_aux:nn}
 % \begin{macro}{\@@_print_quantity:n, \@@_print_quantity:x}
-% \begin{macro}{\@@_print_separator:n, \@@_print_separator:V}
+% \begin{macro}
+%   {
+%     \@@_print_boundary:n, \@@_print_boundary:V,
+%     \@@_print_separator:n, \@@_print_separator:V
+%   }
 %   We now need to know how many entries there are: the reason we don't use
 %   \cs{seq_use:Nnnn} is that we want to be able to insert
 %   \cs{siunitx_print_\dots:n} in a controlled way.
@@ -760,6 +807,7 @@
           }
         { 2 }
           {
+            \@@_print_boundary:V \l_@@_boundary_open_tl
             #4
               {
                 \exp_not:n {#2}
@@ -771,6 +819,7 @@
                 \seq_item:Nn \l_@@_tmp_seq { 2 }
                 \exp_not:n {#3}
               }
+            \@@_print_boundary:V \l_@@_boundary_open_tl
           }
       }
       {
@@ -778,9 +827,11 @@
         \tl_set:Nn \l_@@_start_tl {#2}
         \tl_set:Nn \l_@@_end_tl {#3}
         \cs_set_eq:NN \@@_print_aux:n #4
+        \@@_print_boundary:V \l_@@_boundary_open_tl
         \seq_map_indexed_function:NN
           \l_@@_tmp_seq
           \@@_print_aux:nn
+        \@@_print_boundary:V \l_@@_boundary_close_tl
       }
   }
 \cs_new_protected:Npn \@@_print_aux:n #1 { }
@@ -819,6 +870,16 @@
 \cs_new_protected:Npn \@@_print_quantity:n #1
   { \siunitx_quantity_print:nV {#1} \l_@@_unit_tl }
 \cs_generate_variant:Nn  \@@_print_quantity:n { x }
+\cs_new_protected:Npn \@@_print_boundary:n #1
+  {
+    \tl_if_blank:nF {#1}
+      {
+        \bool_if:NTF \l_@@_boundary_text_bool
+          { #1 }
+          { \siunitx_print_number:n {#1} }
+      }
+  }
+\cs_generate_variant:Nn \@@_print_boundary:n { V }
 \cs_new_protected:Npn \@@_print_separator:n #1
   {
     \bool_if:NTF \l_@@_separator_text_bool
@@ -923,9 +984,11 @@
   {
     \keys_set:nx { siunitx }
       {
+        compound-close-boundary  = ,
         compound-exponents       = \l_@@_exp_tl ,
         compound-final-separator =
           { \exp_not:V \l_siunitx_list_separator_final_tl } ,
+        compound-open-boundary   = ,
         compound-pair-separator  =
           { \exp_not:V \l_siunitx_list_separator_pair_tl } ,
         compound-separator       =
@@ -1009,8 +1072,10 @@
   {
     \keys_set:nx { siunitx }
       {
+        compound-close-boundary  = ,
         compound-exponents       = \l_@@_exp_tl ,
         compound-final-separator = { \exp_not:n {#1} } ,
+        compound-open-boundary   = ,
         compound-pair-separator  = { \exp_not:n {#1} } ,
         compound-separator       = { \exp_not:n {#1} } ,
         compound-separator-mode  =
@@ -1036,6 +1101,7 @@
 % \begin{variable}
 %   {
 %     \l_@@_exp_tl               ,
+%     \l_@@_open_tl              ,
 %     \l_siunitx_range_phrase_tl ,
 %     \l_@@_units_tl
 %   }
@@ -1048,6 +1114,7 @@
     range-exponents .choices:nn =
       { combine , combine-bracket , individual }
       { \tl_set_eq:NN \l_@@_exp_tl \l_keys_choice_tl } ,
+    range-open-phrase .tl_set:N = \l_@@_open_tl ,
     range-phrase .tl_set:N = \l_siunitx_range_phrase_tl ,
     range-units .choices:nn =
       { bracket , repeat , single }
@@ -1079,10 +1146,13 @@
   {
     \keys_set:nx { siunitx }
       {
-        compound-exponents       = \l_@@_exp_tl ,
-        compound-pair-separator  = { \exp_not:V \l_siunitx_range_phrase_tl } ,
-        compound-separator-mode  = text ,
-        compound-units           = \l_@@_units_tl
+        compound-boundary-mode  = text ,
+        compound-close-boundary = ,
+        compound-exponents      = \l_@@_exp_tl ,
+        compound-open-boundary  = { \exp_not:V \l_@@_open_tl } ,
+        compound-pair-separator = { \exp_not:V \l_siunitx_range_phrase_tl } ,
+        compound-separator-mode = text ,
+        compound-units          = \l_@@_units_tl
       }
   }
 %    \end{macrocode}
@@ -1098,13 +1168,16 @@
 %    \begin{macrocode}
 \keys_set:nn { siunitx }
   {
-    compound-exponents       = individual  ,
+    compound-boundary-mode   = text       ,
+    compound-close-boundary  =            ,
+    compound-exponents       = individual ,
     compound-final-separator =
       {
         \ifmmode \  \else \space \fi
         \text { and }
         \ifmmode \  \else \space \fi
       } ,
+    compound-open-boundary  =             ,
     compound-pair-separator  =
       {
         \ifmmode \  \else \space \fi
@@ -1113,9 +1186,9 @@
       } ,
     compound-separator       =
       { , \ifmmode \  \else \space \fi } ,
-    compound-separator-mode  = text        ,
-    compound-units           = repeat      ,
-    list-exponents           = individual  ,
+    compound-separator-mode  = text       ,
+    compound-units           = repeat     ,
+    list-exponents           = individual ,
     list-final-separator     =
       {
         \ifmmode \  \else \space \fi
@@ -1130,9 +1203,9 @@
       } ,
     list-separator           =
       { , \ifmmode \  \else \space \fi } ,
-    list-units               = repeat      ,
-    product-exponents        = individual  ,
-    product-mode             = symbol      ,
+    list-units               = repeat     ,
+    product-exponents        = individual ,
+    product-mode             = symbol     ,
     product-phrase           =
       {
         \ifmmode \  \else \space \fi
@@ -1142,6 +1215,7 @@
     product-symbol           = \times      ,
     product-units            = repeat      ,
     range-exponents          = individual  ,
+    range-open-phrase        =             ,
     range-phrase             =
       {
         \ifmmode \  \else \space \fi
diff --git a/siunitx.tex b/siunitx.tex
index ae0471b5..eeddf61e 100644
--- a/siunitx.tex
+++ b/siunitx.tex
@@ -1995,6 +1995,7 @@ \subsection{Lists, products and ranges}
         product-symbol       & Literal & \cs{times}           \\
         product-units        & Choice  & repeat               \\
         range-exponents      & Choice  & individual           \\
+        range-open-phrase    & Literal & \meta{empty}         \\
         range-phrase         & Literal & \verb*= \text{to} =  \\
         range-units          & Choice  & repeat               \\
       \bottomrule
@@ -2047,6 +2048,7 @@ \subsection{Lists, products and ranges}
   \numproduct[product-phrase = { BY }]{5 x 100 x 2} \\
 \end{LaTeXdemo}
 
+\DescribeOption{range-open-phrase}
 \DescribeOption{range-phrase}
 Ranges of numbers can be given as input. These will have an appropriate word or
 symbol inserted between the two entries: this is stored using the
@@ -2056,6 +2058,12 @@ \subsection{Lists, products and ranges}
   \numrange{5}{100} \\
   \numrange[range-phrase = --]{5}{100}
 \end{LaTeXdemo}
+In some languages, an opening phrase is \emph{required}; this is supported
+using the \opt{range-open-phrase} key.
+\begin{LaTeXdemo}
+  \numrange{10}{12} \\
+  \numrange[range-open-phrase = {\text{from} }]{5}{100}
+\end{LaTeXdemo}
 
 \DescribeOption{list-exponents}
 \DescribeOption{product-exponents}
diff --git a/testfiles/siunitx-compound.luatex.tlg b/testfiles/siunitx-compound.luatex.tlg
index c1745199..2bf7a4d0 100644
--- a/testfiles/siunitx-compound.luatex.tlg
+++ b/testfiles/siunitx-compound.luatex.tlg
@@ -1525,7 +1525,125 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 9: Option setting "list-exponents"
+TEST 9: Option settings "compound-open-boundary" and"compound-close-boundary"
+============================================================
+> \box...=
+\hbox(6.44444+0.0)x5.00002, direction TLT
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94+0.11)x32.78003, direction TLT
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.11)x16.12, direction TLT
+..\TU/lmr/m/n/10 a
+..\TU/lmr/m/n/10 n
+..\TU/lmr/m/n/10 d
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94+1.93)x43.89005, direction TLT
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\TU/lmr/m/n/10 ,
+.\glue(\spaceskip) 3.33 plus 2.08124 minus 0.888
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.11)x16.12, direction TLT
+..\TU/lmr/m/n/10 a
+..\TU/lmr/m/n/10 n
+..\TU/lmr/m/n/10 d
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 3
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.44444+0.0)x5.00002, direction TLT
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(7.16+0.11)x47.78003, direction TLT
+.\mathon
+.\hbox(7.16+0.0)x7.5, direction TLT
+..\hbox(7.16+0.0)x7.5, direction TLT
+...\TU/lmr/m/n/10 A
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.11)x16.12, direction TLT
+..\TU/lmr/m/n/10 a
+..\TU/lmr/m/n/10 n
+..\TU/lmr/m/n/10 d
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\mathon
+.\hbox(7.16+0.0)x7.5, direction TLT
+..\hbox(7.16+0.0)x7.5, direction TLT
+...\TU/lmr/m/n/10 A
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(7.16+1.93)x61.67004, direction TLT
+.\mathon
+.\hbox(7.16+0.0)x7.5, direction TLT
+..\hbox(7.16+0.0)x7.5, direction TLT
+...\TU/lmr/m/n/10 A
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\TU/lmr/m/n/10 ,
+.\glue(\spaceskip) 3.33 plus 2.08124 minus 0.888
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.11)x16.12, direction TLT
+..\TU/lmr/m/n/10 a
+..\TU/lmr/m/n/10 n
+..\TU/lmr/m/n/10 d
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 3
+.\mathoff
+.\mathon
+.\hbox(6.83+0.22)x10.28, direction TLT
+..\hbox(6.83+0.22)x10.28, direction TLT
+...\TU/lmr/m/n/10 W
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+============================================================
+============================================================
+TEST 10: Option setting "list-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x31.70831, direction TLT
@@ -1786,7 +1904,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 10: Option setting "product-exponents"
+TEST 11: Option setting "product-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x31.70831, direction TLT
@@ -2083,7 +2201,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 11: Option setting "product-mode"
+TEST 12: Option setting "product-mode"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002, direction TLT
@@ -2192,7 +2310,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 12: Option setting "product-symbol"
+TEST 13: Option setting "product-symbol"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002, direction TLT
@@ -2301,7 +2419,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 13: Option setting "product-phrase"
+TEST 14: Option setting "product-phrase"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002, direction TLT
@@ -2404,7 +2522,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 14: Option setting "range-exponents"
+TEST 15: Option setting "range-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x78.96663, direction TLT
@@ -2648,7 +2766,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 15: Option setting "range-phrase"
+TEST 16: Option settings "range-open phrase" and "range-phrase"
 ============================================================
 > \box...=
 \hbox(6.44444+0.11)x25.55003, direction TLT
@@ -2678,9 +2796,43 @@ l. ...  }
 ! OK.
 <argument> \l_tmpa_box 
 l. ...  }
+> \box...=
+\hbox(7.05+0.11)x72.83003, direction TLT
+.\mathon
+.\hbox(7.05+0.11)x20.31, direction TLT
+..\hbox(7.05+0.11)x20.31, direction TLT
+...\TU/lmr/m/n/10 f
+...\TU/lmr/m/n/10 r
+...\TU/lmr/m/n/10 o
+...\TU/lmr/m/n/10 m
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\hbox(6.15+0.11)x8.89, direction TLT
+..\TU/lmr/m/n/10 t
+..\TU/lmr/m/n/10 o
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\mathon
+.\hbox(7.05+0.11)x20.31, direction TLT
+..\hbox(7.05+0.11)x20.31, direction TLT
+...\TU/lmr/m/n/10 f
+...\TU/lmr/m/n/10 r
+...\TU/lmr/m/n/10 o
+...\TU/lmr/m/n/10 m
+.\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
 ============================================================
 ============================================================
-TEST 16: Option setting "compound-units"
+TEST 17: Option setting "compound-units"
 ============================================================
 > \box...=
 \hbox(6.94+1.93)x73.89027, direction TLT
@@ -3206,7 +3358,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 17: Option setting "list-units"
+TEST 18: Option setting "list-units"
 ============================================================
 > \box...=
 \hbox(6.94+1.93)x73.89027, direction TLT
@@ -3562,7 +3714,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 18: Option setting "product-units"
+TEST 19: Option setting "product-units"
 ============================================================
 > \box...=
 \hbox(6.44444+0.83333)x69.44455, direction TLT
@@ -4160,7 +4312,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 19: Option setting "range-units"
+TEST 20: Option setting "range-units"
 ============================================================
 > \box...=
 \hbox(6.44444+0.11)x45.55019, direction TLT
@@ -4420,7 +4572,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 20: Option settings "parse-numbers = false"
+TEST 21: Option settings "parse-numbers = false"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x15.00009, direction TLT
@@ -4501,7 +4653,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 21: Option settings "prefix-mode" and "compound-units"
+TEST 22: Option settings "prefix-mode" and "compound-units"
 ============================================================
 > \box...=
 \hbox(6.94444+1.93)x90.55699, direction TLT
@@ -5027,7 +5179,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 22: Option setting "uncertainty-mode = separate"
+TEST 23: Option setting "uncertainty-mode = separate"
 ============================================================
 > \box...=
 \hbox(7.5+2.5)x93.89142, direction TLT
@@ -5227,7 +5379,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 23: Option settings "mode" and "output-decimal-marker"
+TEST 24: Option settings "mode" and "output-decimal-marker"
 ============================================================
 > \box...=
 \hbox(6.66+1.93)x27.77672, direction TLT
@@ -5314,7 +5466,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 24: Option settings "range-units = single" and "per-mode=symbol"
+TEST 25: Option settings "range-units = single" and "per-mode=symbol"
 ============================================================
 > \box...=
 \hbox(7.5+2.5)x37.77788, direction TLT
diff --git a/testfiles/siunitx-compound.lvt b/testfiles/siunitx-compound.lvt
index cd7c83a1..ef4f6731 100644
--- a/testfiles/siunitx-compound.lvt
+++ b/testfiles/siunitx-compound.lvt
@@ -185,6 +185,25 @@
     \test:nn { compound } { { 1e2 } { 2e3 } { 3e1 } }
   }
 
+\TEST
+  {
+    Option~settings~"compound-open-boundary"~and
+    "compound-close-boundary"
+  }
+  {
+    \test:nn { compound } { { 1 } }
+    \test:nn { compound } { { 1 } { 2 } }
+    \test:nn { compound } { { 1 } { 2 } { 3 } }
+    \keys_set:nn { siunitx }
+      {
+        compound-open-boundary  = \text { A } ,
+        compound-close-boundary = \text { W }
+      }
+    \test:nn { compound } { { 1 } }
+    \test:nn { compound } { { 1 } { 2 } }
+    \test:nn { compound } { { 1 } { 2 } { 3 } }
+  }
+
 \TEST { Option~setting~"list-exponents" }
   {
     \test:nn { list } { { 1e2 } }
@@ -266,10 +285,21 @@
     \test:nn { 1e2 } { 2e1 }
   }
 
-\TEST { Option~setting~"range-phrase" }
+\TEST { Option~settings~"range-open~phrase"~and~"range-phrase" }
   {
     \test:nn { 1 } { 2 }
-    \keys_set:nn { siunitx } { range-phrase = -- }
+    \group_begin:
+      \keys_set:nn { siunitx } { range-phrase = -- }
+      \test:nn { 1 } { 2 }
+    \group_end:
+    \keys_set:nn { siunitx }
+      {
+        range-open-phrase =
+          {
+            \text { from }
+            \ifmmode \  \else \space \fi
+          }
+      }
     \test:nn { 1 } { 2 }
   }
 
diff --git a/testfiles/siunitx-compound.tlg b/testfiles/siunitx-compound.tlg
index 1d6b9396..b24dfe85 100644
--- a/testfiles/siunitx-compound.tlg
+++ b/testfiles/siunitx-compound.tlg
@@ -1525,7 +1525,125 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 9: Option setting "list-exponents"
+TEST 9: Option settings "compound-open-boundary" and"compound-close-boundary"
+============================================================
+> \box...=
+\hbox(6.44444+0.0)x5.00002
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94444+0.0)x32.77785
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\hbox(6.94444+0.0)x16.11116
+..\OT1/cmr/m/n/10 a
+..\OT1/cmr/m/n/10 n
+..\OT1/cmr/m/n/10 d
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94444+1.94444)x43.88898
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\OT1/cmr/m/n/10 ,
+.\glue 3.33333 plus 2.08331 minus 0.88889
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\hbox(6.94444+0.0)x16.11116
+..\OT1/cmr/m/n/10 a
+..\OT1/cmr/m/n/10 n
+..\OT1/cmr/m/n/10 d
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\mathon
+.\OT1/cmr/m/n/10 3
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.44444+0.0)x5.00002
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94444+0.0)x47.77788
+.\mathon
+.\hbox(6.83331+0.0)x7.50002
+..\hbox(6.83331+0.0)x7.50002
+...\OT1/cmr/m/n/10 A
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\hbox(6.94444+0.0)x16.11116
+..\OT1/cmr/m/n/10 a
+..\OT1/cmr/m/n/10 n
+..\OT1/cmr/m/n/10 d
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\mathon
+.\hbox(6.83331+0.0)x7.50002
+..\hbox(6.83331+0.0)x7.50002
+...\OT1/cmr/m/n/10 A
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94444+1.94444)x61.6668
+.\mathon
+.\hbox(6.83331+0.0)x7.50002
+..\hbox(6.83331+0.0)x7.50002
+...\OT1/cmr/m/n/10 A
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\OT1/cmr/m/n/10 ,
+.\glue 3.33333 plus 2.08331 minus 0.88889
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\hbox(6.94444+0.0)x16.11116
+..\OT1/cmr/m/n/10 a
+..\OT1/cmr/m/n/10 n
+..\OT1/cmr/m/n/10 d
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\mathon
+.\OT1/cmr/m/n/10 3
+.\mathoff
+.\mathon
+.\hbox(6.83331+0.0)x10.2778
+..\hbox(6.83331+0.0)x10.2778
+...\OT1/cmr/m/n/10 W
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+============================================================
+============================================================
+TEST 10: Option setting "list-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x31.70831
@@ -1786,7 +1904,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 10: Option setting "product-exponents"
+TEST 11: Option setting "product-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x31.70831
@@ -2083,7 +2201,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 11: Option setting "product-mode"
+TEST 12: Option setting "product-mode"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002
@@ -2192,7 +2310,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 12: Option setting "product-symbol"
+TEST 13: Option setting "product-symbol"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002
@@ -2301,7 +2419,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 13: Option setting "product-phrase"
+TEST 14: Option setting "product-phrase"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002
@@ -2404,7 +2522,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 14: Option setting "range-exponents"
+TEST 15: Option setting "range-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x78.9722
@@ -2648,7 +2766,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 15: Option setting "range-phrase"
+TEST 16: Option settings "range-open phrase" and "range-phrase"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x25.5556
@@ -2678,9 +2796,43 @@ l. ...  }
 ! OK.
 <argument> \l_tmpa_box 
 l. ...  }
+> \box...=
+\hbox(6.94444+0.0)x72.8335
+.\mathon
+.\hbox(6.94444+0.0)x20.30562
+..\hbox(6.94444+0.0)x20.30562
+...\OT1/cmr/m/n/10 f
+...\OT1/cmr/m/n/10 r
+...\OT1/cmr/m/n/10 o
+...\OT1/cmr/m/n/10 m
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\hbox(6.15079+0.0)x8.88892
+..\OT1/cmr/m/n/10 t
+..\OT1/cmr/m/n/10 o
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\mathon
+.\hbox(6.94444+0.0)x20.30562
+..\hbox(6.94444+0.0)x20.30562
+...\OT1/cmr/m/n/10 f
+...\OT1/cmr/m/n/10 r
+...\OT1/cmr/m/n/10 o
+...\OT1/cmr/m/n/10 m
+.\glue 3.33333 plus 1.66666 minus 1.11111
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
 ============================================================
 ============================================================
-TEST 16: Option setting "compound-units"
+TEST 17: Option setting "compound-units"
 ============================================================
 > \box...=
 \hbox(6.94444+1.94444)x73.8892
@@ -3206,7 +3358,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 17: Option setting "list-units"
+TEST 18: Option setting "list-units"
 ============================================================
 > \box...=
 \hbox(6.94444+1.94444)x73.8892
@@ -3562,7 +3714,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 18: Option setting "product-units"
+TEST 19: Option setting "product-units"
 ============================================================
 > \box...=
 \hbox(6.44444+0.83333)x69.44455
@@ -4160,7 +4312,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 19: Option setting "range-units"
+TEST 20: Option setting "range-units"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x45.55576
@@ -4420,7 +4572,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 20: Option settings "parse-numbers = false"
+TEST 21: Option settings "parse-numbers = false"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x15.00009
@@ -4501,7 +4653,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 21: Option settings "prefix-mode" and "compound-units"
+TEST 22: Option settings "prefix-mode" and "compound-units"
 ============================================================
 > \box...=
 \hbox(6.94444+1.94444)x90.55592
@@ -5027,7 +5179,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 22: Option setting "uncertainty-mode = separate"
+TEST 23: Option setting "uncertainty-mode = separate"
 ============================================================
 > \box...=
 \hbox(7.5+2.5)x93.88924
@@ -5227,7 +5379,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 23: Option settings "mode" and "output-decimal-marker"
+TEST 24: Option settings "mode" and "output-decimal-marker"
 ============================================================
 > \box...=
 \hbox(6.44444+1.94444)x27.77791
@@ -5314,7 +5466,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 24: Option settings "range-units = single" and "per-mode=symbol"
+TEST 25: Option settings "range-units = single" and "per-mode=symbol"
 ============================================================
 > \box...=
 \hbox(7.5+2.5)x37.77788
diff --git a/testfiles/siunitx-compound.xetex.tlg b/testfiles/siunitx-compound.xetex.tlg
index 731e429c..cca14407 100644
--- a/testfiles/siunitx-compound.xetex.tlg
+++ b/testfiles/siunitx-compound.xetex.tlg
@@ -1445,7 +1445,117 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 9: Option setting "list-exponents"
+TEST 9: Option settings "compound-open-boundary" and"compound-close-boundary"
+============================================================
+> \box...=
+\hbox(6.44444+0.0)x5.00002
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94+0.10999)x32.78003
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.10999)x16.12
+..\TU/lmr/m/n/10 and
+.\glue 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.94+1.92998)x43.89005
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\TU/lmr/m/n/10 ,
+.\glue 3.33 plus 2.08124 minus 0.888
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\glue 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.10999)x16.12
+..\TU/lmr/m/n/10 and
+.\glue 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 3
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(6.44444+0.0)x5.00002
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(7.16+0.10999)x47.78003
+.\mathon
+.\hbox(7.16+0.0)x7.5
+..\hbox(7.16+0.0)x7.5
+...\TU/lmr/m/n/10 A
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.10999)x16.12
+..\TU/lmr/m/n/10 and
+.\glue 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\mathon
+.\hbox(7.16+0.0)x7.5
+..\hbox(7.16+0.0)x7.5
+...\TU/lmr/m/n/10 A
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+> \box...=
+\hbox(7.16+1.92998)x61.67004
+.\mathon
+.\hbox(7.16+0.0)x7.5
+..\hbox(7.16+0.0)x7.5
+...\TU/lmr/m/n/10 A
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\TU/lmr/m/n/10 ,
+.\glue 3.33 plus 2.08124 minus 0.888
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\glue 3.33 plus 1.665 minus 1.11
+.\hbox(6.94+0.10999)x16.12
+..\TU/lmr/m/n/10 and
+.\glue 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 3
+.\mathoff
+.\mathon
+.\hbox(6.83+0.21999)x10.28
+..\hbox(6.83+0.21999)x10.28
+...\TU/lmr/m/n/10 W
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
+============================================================
+============================================================
+TEST 10: Option setting "list-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x31.70831
@@ -1694,7 +1804,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 10: Option setting "product-exponents"
+TEST 11: Option setting "product-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x31.70831
@@ -1991,7 +2101,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 11: Option setting "product-mode"
+TEST 12: Option setting "product-mode"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002
@@ -2094,7 +2204,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 12: Option setting "product-symbol"
+TEST 13: Option setting "product-symbol"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002
@@ -2203,7 +2313,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 13: Option setting "product-phrase"
+TEST 14: Option setting "product-phrase"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x5.00002
@@ -2288,7 +2398,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 14: Option setting "range-exponents"
+TEST 15: Option setting "range-exponents"
 ============================================================
 > \box...=
 \hbox(8.14003+0.83333)x78.96663
@@ -2523,7 +2633,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 15: Option setting "range-phrase"
+TEST 16: Option settings "range-open phrase" and "range-phrase"
 ============================================================
 > \box...=
 \hbox(6.44444+0.10999)x25.55003
@@ -2552,9 +2662,36 @@ l. ...  }
 ! OK.
 <argument> \l_tmpa_box 
 l. ...  }
+> \box...=
+\hbox(7.05+0.10999)x72.83003
+.\mathon
+.\hbox(7.05+0.10999)x20.31
+..\hbox(7.05+0.10999)x20.31
+...\TU/lmr/m/n/10 from
+.\glue 3.33 plus 1.665 minus 1.11
+.\mathoff
+.\mathon
+.\OT1/cmr/m/n/10 1
+.\mathoff
+.\glue 3.33 plus 1.665 minus 1.11
+.\hbox(6.15+0.10999)x8.89
+..\TU/lmr/m/n/10 to
+.\glue 3.33 plus 1.665 minus 1.11
+.\mathon
+.\OT1/cmr/m/n/10 2
+.\mathoff
+.\mathon
+.\hbox(7.05+0.10999)x20.31
+..\hbox(7.05+0.10999)x20.31
+...\TU/lmr/m/n/10 from
+.\glue 3.33 plus 1.665 minus 1.11
+.\mathoff
+! OK.
+<argument> \l_tmpa_box 
+l. ...  }
 ============================================================
 ============================================================
-TEST 16: Option setting "compound-units"
+TEST 17: Option setting "compound-units"
 ============================================================
 > \box...=
 \hbox(6.94+1.92998)x73.89027
@@ -3056,7 +3193,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 17: Option setting "list-units"
+TEST 18: Option setting "list-units"
 ============================================================
 > \box...=
 \hbox(6.94+1.92998)x73.89027
@@ -3396,7 +3533,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 18: Option setting "product-units"
+TEST 19: Option setting "product-units"
 ============================================================
 > \box...=
 \hbox(6.44444+0.83333)x69.44455
@@ -3994,7 +4131,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 19: Option setting "range-units"
+TEST 20: Option setting "range-units"
 ============================================================
 > \box...=
 \hbox(6.44444+0.10999)x45.55019
@@ -4246,7 +4383,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 20: Option settings "parse-numbers = false"
+TEST 21: Option settings "parse-numbers = false"
 ============================================================
 > \box...=
 \hbox(6.44444+0.0)x15.00009
@@ -4323,7 +4460,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 21: Option settings "prefix-mode" and "compound-units"
+TEST 22: Option settings "prefix-mode" and "compound-units"
 ============================================================
 > \box...=
 \hbox(6.94444+1.92998)x90.55699
@@ -4825,7 +4962,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 22: Option setting "uncertainty-mode = separate"
+TEST 23: Option setting "uncertainty-mode = separate"
 ============================================================
 > \box...=
 \hbox(7.5+2.5)x93.89142
@@ -5017,7 +5154,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 23: Option settings "mode" and "output-decimal-marker"
+TEST 24: Option settings "mode" and "output-decimal-marker"
 ============================================================
 > \box...=
 \hbox(6.66+1.92998)x27.77672
@@ -5082,7 +5219,7 @@ l. ...  }
 l. ...  }
 ============================================================
 ============================================================
-TEST 24: Option settings "range-units = single" and "per-mode=symbol"
+TEST 25: Option settings "range-units = single" and "per-mode=symbol"
 ============================================================
 > \box...=
 \hbox(7.5+2.5)x37.77788