diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0d156ed2..26cea7dc2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## Changed
 - Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h
+- bluetooth.h: extract internal defintitions to respective protocol layers
 
 ## Changes August 2019