diff --git a/fritz_temp_sync/config.yaml b/fritz_temp_sync/config.yaml
index f564228..25e7e4f 100755
--- a/fritz_temp_sync/config.yaml
+++ b/fritz_temp_sync/config.yaml
@@ -29,3 +29,4 @@ schema:
     - sensor: str
       thermostate: str
   update_timeout: int
+  log_level: "str?"