diff --git a/CHANGELOG.md b/CHANGELOG.md
index a21b1277155d2..d948d1bc0e27f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -76,6 +76,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Updated jackson to 2.13.4 and snakeyml to 1.32 ([#4563](https://github.com/opensearch-project/OpenSearch/pull/4563))
 - Add BWC version 1.3.7 ([#4709](https://github.com/opensearch-project/OpenSearch/pull/4709))
 - Bump `jettison` from 1.4.1 to 1.5.1 ([#4717](https://github.com/opensearch-project/OpenSearch/pull/4717))
+- Set analyzer to regex query string search ([4219](https://github.com/opensearch-project/OpenSearch/pull/4219))
 
 ### Changed