diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b8cfb03986..504d58cef5b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Fix `SumAggregation`
+  ([#3390](https://github.com/open-telemetry/opentelemetry-python/pull/3390))
+
+
 ## Version 1.20.0/0.41b0 (2023-09-04)
 
 - Modify Prometheus exporter to translate non-monotonic Sums into Gauges