diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6791f7b..ce79aa2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,11 @@ list yields a list of all related PRs for each release.
 
 # [unreleased]
 
+## Changed
+
+- Updated ACS SS commands for OBSW ACS SS update.
+  PR: https://egit.irs.uni-stuttgart.de/eive/eive-tmtc/pulls/130
+
 ## Fixed
 
 - Fixed parsing of processed GPS data