diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f8a52ddd40..98d9643087b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 ### Added
 - [#851](https://github.com/improbable-eng/thanos/pull/851) New read API endpoint for api/v1/rules and api/v1/alerts.
 - [#873](https://github.com/improbable-eng/thanos/pull/873) Store: fix set index cache LRU.
+- [#905](https://github.com/improbable-eng/thanos/pull/905) New Query API: /api/v1/labels. Noticed that the API was added in Prometheus v2.6.
 
 ### Fixed
 - [#833](https://github.com/improbable-eng/thanos/issues/833) Store Gateway matcher regression for intersecting with empty posting.