diff --git a/CHANGELOG.md b/CHANGELOG.md
index b40eaa46..666fb053 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,8 @@ TMTC rev: 15adb9bf2ec68304a4f87b8dd418c1a8353283a3
 
 ## Changed
 
+- ACS Subsystem Sequence Mode IDs updated.
+  PR: https://egit.irs.uni-stuttgart.de/eive/eive-obsw/pulls/365
 - Update and tweak ACS subsystem to represent the actual ACS design
 - Event handling in the ACS subsystem for events triggered by the ACS controller.
   PR: https://egit.irs.uni-stuttgart.de/eive/eive-obsw/pulls/365