diff --git a/custom_components/e_thermostaat/climate.py b/custom_components/e_thermostaat/climate.py
index 21327fb..6cd3b41 100644
--- a/custom_components/e_thermostaat/climate.py
+++ b/custom_components/e_thermostaat/climate.py
@@ -171,6 +171,7 @@ def target_temperature(self):
     
     @property
     def available(self) -> bool:
+        """Return True if entity is available."""
         return self._last_seen and datetime.datetime.now() - self._last_seen < datetime.timedelta(seconds=600)
 
     @property