diff --git a/models/db.py b/models/db.py
index 5595fe3f..28dcb664 100755
--- a/models/db.py
+++ b/models/db.py
@@ -245,7 +245,7 @@
     Field('wikidata', type='integer'),
     Field('wikipedia_lang_flag', type='integer'), #
     Field('eol', type='integer'),
-    Field('rnk', type='string', length=name_rank_chars),
+    Field('rnk', type='string', length=name_rank_chars),  # The taxonomic rank, e.f. "genus"
     Field('raw_popularity', type='double'),
     Field('popularity', type='double'),
     #the following 5 fields are sources listed by the OpenTree
diff --git a/views/developer/changelog.html b/views/developer/changelog.html
index 24f4c1a6..4640ddfa 100644
--- a/views/developer/changelog.html
+++ b/views/developer/changelog.html
@@ -17,22 +17,22 @@ <h2>OneZoom software versions</h2>
       
   <ul class="uk-list">
     <li>
-      <h4>Version 4.0 'paradoxical frog' (current version - April 2024)</h4>
+      <h4>Version 4.0 '<a href="{{=URL('/life/@=1035873', url_encode=False)}}">paradoxical frog</a>' (current version - April 2024)</h4>
       <p> An evolution of the OneZoom UI from version 3.6, accounting for user / expert feedback and to account for the development of OneZoom TreeTours: guided visits around the tree of life with accompanying video and audio.</p>
       <a href="{{=URL('static','images/TourWithVideo.jpg')}}" target = "_blank" class="thumbnail"><img src= "{{=URL('static','images/TourWithVideo.jpg')}}" alt=""></a>      
       <p>New tours can be created via a <a href="https://github.com/OneZoom/tours">separate GitHub repository</a>. Under the hood, other improvements have been made e.g. in pinpointing areas of the tree to display and in the code used to piece together the underlying data behind the tree of life (also placed into <a href="https://github.com/OneZoom/tree-build">its own GitHub repository</a>). Various minor bugs have also been fixed, and testing of the OneZoom codebase has been substantially increased.</p>
     </li>
     <li>
-      <h4>Version 3.6 'musical furry lobster' (obsolete)</h4>
+      <h4>Version 3.6 '<a href="{{=URL('/life/@=14026', url_encode=False)}}">musical furry lobster</a>' (obsolete)</h4>
       <p> Includes all the features of version 3.5 but adds species ocurrence maps, a docker image, and the ability to display and renew personal sponsorships easily.</p>
     </li>
     <li>
-      <h4>Version 3.5 'chocolate chip starfish' (obsolete)</h4>
+      <h4>Version 3.5 '<a href="{{=URL('/life/@=293690', url_encode=False)}}">chocolate chip starfish</a>' (obsolete)</h4>
       <a href="{{=URL('static','images/user_guide/FullSize/Pop_col_scheme.jpg')}}" target = "_blank" class="thumbnail"><img src= "{{=URL('static','images/user_guide/Pop_col_scheme.jpg')}}" alt=""></a>
       <p> Includes all the features of version 3.4.1 but adds several improvements i) improved colour scheme for showing extinction risk of species ii) added colour scheme for showing the popularity index of species as a continuous colour gradient iii) main colour schemes now show randomly resolved polytomies in a different way on the tree for improved scientific accuracy and to avoid misunderstandings about the level of accuracy in the current tree. iv) colour blind friendly mode available for all colour schemes v) improved tabs for each species linking to other resources with better explanation around the IUCN resources and added links to GBIF vi) substantial improvements to the content and interpretation pages throughout the site vii) new resources explaining how to use the tree of life explorer viii) docker images for easier deployment by third parties ix) a range of minor bug fixes.</p>
     </li>
     <li>
-      <h4>Version 3.4.1 'nervous shark' (obsolete)</h4>
+      <h4>Version 3.4.1 '<a href="{{=URL('/life/@=649205', url_encode=False)}}">nervous shark</a>' (obsolete)</h4>
       <p> Includes all the features of version 3.4 and adds new APIs to access vernacular names, ID mappings and representative images.</p>
     </li>
     <li>