diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ddd044f87a..262544d4c98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 ## Unreleased
 
 ### Added
+- [#4482](https://github.com/thanos-io/thanos/pull/4482) COS: Add http_config for cos object store client.
 
 ### Fixed