diff --git a/DESCRIPTION b/DESCRIPTION
index 8bb87fe..c1827cd 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: chorddiag
 Title: Interactive Chord Diagrams
-Version: 0.1.1
+Version: 0.1.2
 Authors@R: c(
     person("Matthias", "Flor", email = "matthias.c.flor@gmail.com", role = c("aut", "cre")),
     person("Elizabeth", "Tang", email = "eliz.thf@gmail.com", role = "ctb"))
diff --git a/R/chorddiag.R b/R/chorddiag.R
index 8aba987..27258e0 100644
--- a/R/chorddiag.R
+++ b/R/chorddiag.R
@@ -68,7 +68,11 @@
 #' @param precision Integer number of significant digits to be used for tooltip
 #'   display.
 #' @param clickAction character string containing JavaScript code to be executed
-#'   on a mouse click so that shiny can get the sourceIndex and targetIndex for the purpose of filtering the data on other visualizations
+#'   on a mouse click so that shiny can get the sourceIndex and targetIndex for the
+#'   purpose of filtering the data on other visualizations
+#' @param clickGroupAction character string containing JavaScript code to be executed
+#'   on a mouse click so that shiny can get the groupIndex
+#'
 #'
 #' @source Based on \url{http://bl.ocks.org/mbostock/4062006} with several
 #'   modifications.
@@ -111,7 +115,8 @@ chorddiag <- function(data,
                       tooltipFontsize = 12,
                       tooltipGroupConnector = " &#x25B6; ",
                       precision = NULL,
-                      clickAction = NULL) {
+                      clickAction = NULL,
+                      clickGroupAction = NULL) {
 
     if (!is.matrix(data))
         stop("'data' must be a matrix class object.")
@@ -214,7 +219,8 @@ chorddiag <- function(data,
                                  tooltipUnit = tooltipUnit,
                                  tooltipGroupConnector = tooltipGroupConnector,
                                  precision = precision,
-                                 clickAction = clickAction))
+                                 clickAction = clickAction,
+                                 clickGroupAction = clickGroupAction))
     params = Filter(Negate(is.null), params)
 
     # create widget
diff --git a/chorddiag.Rproj b/chorddiag.Rproj
index 8ec03ca..d23fd00 100644
--- a/chorddiag.Rproj
+++ b/chorddiag.Rproj
@@ -9,7 +9,7 @@ UseSpacesForTab: Yes
 NumSpacesForTab: 4
 Encoding: UTF-8
 
-RnwWeave: Sweave
+RnwWeave: knitr
 LaTeX: pdfLaTeX
 
 AutoAppendNewline: Yes
diff --git a/inst/examples/shiny/server.R b/inst/examples/shiny/server.R
index d61ba4e..84a4c5e 100644
--- a/inst/examples/shiny/server.R
+++ b/inst/examples/shiny/server.R
@@ -21,10 +21,16 @@ shinyServer(function(input, output) {
                   showTicks = input$showTicks,
                   margin = input$margin,
                   clickAction = "Shiny.onInputChange('sourceIndex', d.source.index+1);
-                                Shiny.onInputChange('targetIndex', d.target.index+1);")
+                                 Shiny.onInputChange('targetIndex', d.target.index+1);",
+                  clickGroupAction = "Shiny.onInputChange('groupIndex', d.index+1);")
     )
-    
+
     output$shiny_return <- renderPrint({
-        paste0(groupNames[input$sourceIndex], " <-> ", groupNames[input$targetIndex])
+        paste0("Clicked chord: ", groupNames[input$sourceIndex], " <-> ", groupNames[input$targetIndex])
+    })
+
+    output$shiny_return2 <- renderPrint({
+        paste0("Clicked group: ", groupNames[input$groupIndex])
     })
+
 })
diff --git a/inst/examples/shiny/ui.R b/inst/examples/shiny/ui.R
index 5b24e7f..2eab672 100644
--- a/inst/examples/shiny/ui.R
+++ b/inst/examples/shiny/ui.R
@@ -13,7 +13,8 @@ shinyUI(fluidPage(
 
         mainPanel(
             chorddiagOutput('chorddiag', height = '600px'),
-            verbatimTextOutput("shiny_return")
+            verbatimTextOutput("shiny_return"),
+            verbatimTextOutput("shiny_return2")
         )
     )
 ))
diff --git a/inst/htmlwidgets/chorddiag.js b/inst/htmlwidgets/chorddiag.js
index b710c2c..979c8e2 100644
--- a/inst/htmlwidgets/chorddiag.js
+++ b/inst/htmlwidgets/chorddiag.js
@@ -60,7 +60,9 @@ HTMLWidgets.widget({
         tooltipFontsize = options.tooltipFontsize,
         tooltipUnit = options.tooltipUnit,
         tooltipGroupConnector = options.tooltipGroupConnector,
-        precision = options.precision;
+        precision = options.precision,
+        clickAction = options.clickAction,
+        clickGroupAction = options.clickGroupAction;
 
     d3.select(el).selectAll("div.d3-tip").remove();
 
@@ -155,7 +157,8 @@ HTMLWidgets.widget({
           .on("mouseout", function(d) {
               if (showTooltips) groupTip.hide(d);
               return groupFade(d, 1);
-          });
+          })
+          .on("click", clickGroup);
 
     if (groupedgeColor) {
         groups.style("stroke", groupedgeColor);
@@ -346,7 +349,11 @@ HTMLWidgets.widget({
     }
 
     function click(d) {
-      return eval(options.clickAction);
+      return eval(clickAction);
+    }
+
+    function clickGroup(d) {
+        return eval(clickGroupAction)
     }
 
   }  // end renderValue function
diff --git a/man/chorddiag.Rd b/man/chorddiag.Rd
index d76c60a..b611572 100644
--- a/man/chorddiag.Rd
+++ b/man/chorddiag.Rd
@@ -19,7 +19,7 @@ chorddiag(data, type = "directional", width = NULL, height = NULL,
   showTooltips = TRUE, showZeroTooltips = TRUE, tooltipNames = NULL,
   tooltipUnit = NULL, tooltipFontsize = 12,
   tooltipGroupConnector = " &#x25B6; ", precision = NULL,
-  clickAction = NULL)
+  clickAction = NULL, clickGroupAction = NULL)
 }
 \arguments{
 \item{data}{A matrix containing the data. Must be square for the
@@ -115,7 +115,11 @@ triangle pointing from source to target.}
 display.}
 
 \item{clickAction}{character string containing JavaScript code to be executed
-on a mouse click so that shiny can get the sourceIndex and targetIndex for the purpose of filtering the data on other visualizations}
+on a mouse click so that shiny can get the sourceIndex and targetIndex for the
+purpose of filtering the data on other visualizations}
+
+\item{clickGroupAction}{character string containing JavaScript code to be executed
+on a mouse click so that shiny can get the groupIndex}
 }
 \description{
 Create an interactive chord diagram using the JavaScript visualization