diff --git a/CHANGELOG.md b/CHANGELOG.md
index 30c4a31..60c6c81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Changed
 
-- Nothing.
+- [#55](https://github.com/zendframework/zend-expressive-authentication-oauth2/pull/55) changes how the `OAuth2Adapter` validates when a client ID is present. Previously, if a client ID was present, but not a user ID, it would attempt to pull a user from the user factory using the client ID, which was incorrect. With this release, it no longer does that.
 
 ### Deprecated