diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0cc07f78e..05a8743ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
+## Changed
+
+- Renamed `PCDU_2` subsystem ID to `POWER_SWITCH_IF`.
+- Add new `PowerSwitchIF::SWITCH_UNKNOWN` returnvalue.
+
 # [v6.0.0] 2023-02-10
 
 ## Fixes