diff --git a/CHANGELOG.md b/CHANGELOG.md
index de90a38f5..1e4bb3b3d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added support to read outputs from requests in tests([#324](https://github.com/opensearch-project/opensearch-api-specification/pull/324))
 - Added `eslint-plugin-eslint-comments` ([#333](https://github.com/opensearch-project/opensearch-api-specification/pull/333))
 - Added `distribution` field to `OpenSearchVersionInfo` ([#336](https://github.com/opensearch-project/opensearch-api-specification/pull/336)) 
+- Added `created_time` and `last_updated_time` to `ml.get_model_group@200` ([#342](https://github.com/opensearch-project/opensearch-api-specification/pull/342))
 
 ### Changed
 
diff --git a/spec/namespaces/ml.yaml b/spec/namespaces/ml.yaml
index 4e7b09c56..161e613a6 100644
--- a/spec/namespaces/ml.yaml
+++ b/spec/namespaces/ml.yaml
@@ -177,6 +177,12 @@ components:
               access:
                 type: string
                 description: The model group access.
+              created_time:
+                type: integer
+                format: int64
+              last_updated_time:
+                type: integer
+                format: int64
             required:
               - name
               - latest_version