diff --git a/CHANGELOG.md b/CHANGELOG.md
index b92edd850..1992c4e31 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,3 +20,4 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Documentation
 ### Maintenance
 ### Refactoring
+Deprecate the `max_token_score` field in `neural_sparse` query clause ([#478](https://github.com/opensearch-project/neural-search/pull/478))