diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4d4d0a33..b840df992 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -158,6 +158,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added API spec for `adjust_pure_negative` for bool queries ([#641](https://github.com/opensearch-project/opensearch-api-specification/pull/641))
 - Added a spec style checker [#620](https://github.com/opensearch-project/opensearch-api-specification/pull/620).
 - Added `remote_store` to node `Stats` ([#643](https://github.com/opensearch-project/opensearch-api-specification/pull/643))
+- Added `sm` namespace API specifications ([#701](https://github.com/opensearch-project/opensearch-api-specification/pull/701))
 
 ### Changed