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--- 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