diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45cdd648..d121bbcd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Changed
 
+- Complete refactoring of HK subsystem. Replaced local data pool manager by periodic HK
+  helper. The shared pool and the periodic HK generation are now distinct concepts.
 - Improved File System Abstraction to be more in line with normal filesystems.
 - CFDP implementation was improved, has now even less dependencies on other FSFW components
   and allows one inserted packet per state machine call.