diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2f99925e2929..6756e4d34177d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -68,6 +68,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased 2.x]
 ### Added
+- Add max_shard_size parameter for Shrink API ([#5229](https://github.com/opensearch-project/OpenSearch/pull/5229))
 ### Dependencies
 - Bumps `bcpg-fips` from 1.0.5.1 to 1.0.7.1
 - Bumps `azure-storage-blob` from 12.16.1 to 12.20.0 ([#4995](https://github.com/opensearch-project/OpenSearch/pull/4995))