diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6df3f25c1..8d7fd66a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - wwtemp and wwtemplow to MQTT, Console and Web
 - summer, winter modes for the CW400 thermostat
 - new command under system called `report`. http://ems-esp/api?device=system&cmd=report to generate a report log for troubleshooting
+- thermostat error codes
 
 ### Fixed
 - fix wwontime readback