diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2af46a82..3354d4e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added sync and async sample that uses `search_after` parameter ([859](https://github.com/opensearch-project/opensearch-py/pull/859))
 ### Updated APIs
 ### Changed
+- Small refactor of AWS Signer classes for both sync and async clients ([866](https://github.com/opensearch-project/opensearch-py/pull/866))
 ### Deprecated
 ### Removed
 ### Fixed