diff --git a/CHANGELOG.md b/CHANGELOG.md
index be50e7a..8ab143d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ list yields a list of all related PRs for each release.
 
 # [unreleased]
 
+## Changed
+
+ - PL Subsystem mode ID is int enum now.
+
 # [v5.4.0] 2023-08-15
 
 ## Added