diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40e8055db7..93b57ac0ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#4710](https://github.com/thanos-io/thanos/pull/4710) Store: add metric to capture timestamp of the last loaded block.
 - [#4736](https://github.com/thanos-io/thanos/pull/4736) S3: Add capability to use custom AWS STS Endpoint.
 - [#4764](https://github.com/thanos-io/thanos/pull/4764) Compactor: add `block-viewer.global.sync-block-timeout` flag to set the timeout of synchronization block metas.
+- [#4801](https://github.com/thanos-io/thanos/pull/4801) Compactor: added Prometheus metrics for tracking the progress of compaction and downsampling.
 
 ### Fixed