diff --git a/CHANGELOG.md b/CHANGELOG.md
index 640bf155f37..68ae5a37a55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,9 @@ release.
 
 ### Compatibility
 
+- Fix Prometheus histogram metric suffixes.  Bucket series end in `_bucket`
+  ([#3018](https://github.com/open-telemetry/opentelemetry-specification/pull/3018)).
+
 ### OpenTelemetry Protocol
 
 ### SDK Configuration