diff --git a/CHANGELOG.md b/CHANGELOG.md
index e831448612e..3c06b796837 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -111,6 +111,10 @@ release.
 
 ### Metrics
 
+- Add experimental `OTEL_EXPORTER_OTLP_DEFAULT_HISTOGRAM_AGGREGATION` variable for
+  configuring default histogram aggregation of OTLP metric exporter
+  ([#2619](/~https://github.com/open-telemetry/opentelemetry-specification/pull/2619)).
+
 ### Logs
 
 ### Resource