Add changelog entry for #1220

CHANGES.md

@@ -17,8 +17,8 @@
   Absolute (`{!/foo}`), relative (`{!./foo}`) and package-local (`{!//foo}`)
   are added.
 - Add a marshalled search index consumable by sherlodoc (@EmileTrotignon, @panglesd, #1084)
-- Add a `--index` argument to pass indexes to the document generation, currently
-  used for sidebar (@panglesd, #1145)
+- Add a `--index` argument to pass indexes to the document generation. Generate
+  a full sidebar for pages and values (@panglesd, #1145, #1220)
 - Allow referencing of polymorphic constructors in polymorphic variant type
   aliases (@panglesd, #1115)
 - Added a `--occurrences` argument to the `compile-index` command to output the