diff --git a/CHANGELOG.md b/CHANGELOG.md
index 58d85ccd..f94066d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,11 @@ change warranting a new major release:
 
 # [unreleased]
 
+## Changed
+
+- Remove 2 TCS threads.
+- Move low level polling into ACS PST, move high level device handlers into TCS system task.
+
 # [v1.27.1] 2023-02-13
 
 ## Fixed