diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8094394..aec5c3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Changelog
 
 ## next
+### Added:
+- Implemented `JsonSchema` on types from `indexmap` and `either` (as optional dependencies)
 ### Changed
 - Remove trait bounds from Map/Set JsonSchema impls. They are unnecessary as we never create/use any instances of these types.