diff --git a/CHANGELOG.md b/CHANGELOG.md
index 27873264..5713fae7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ## [Unreleased]
 
 ### Added
+- Added `aggs` alias for nested aggregations ([#818](https://github.com/opensearch-project/opensearch-api-specification/pull/818))
 - Added API specs for query groups lifecycle APIs ([#649](https://github.com/opensearch-project/opensearch-api-specification/pull/649))
 - Added Python and Ruby spec validators ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))
 - Added verbose output of the story being evaluated ([#646](https://github.com/opensearch-project/opensearch-api-specification/pull/646))