diff --git a/homeassistant/components/updater/__init__.py b/homeassistant/components/updater/__init__.py
index cd7d843898e..4617207705b 100644
--- a/homeassistant/components/updater/__init__.py
+++ b/homeassistant/components/updater/__init__.py
@@ -50,9 +50,10 @@ RESPONSE_SCHEMA = vol.Schema(
 
 
 class Updater:
-    """Updater class."""
+    """Updater class for data exchange."""
 
     def __init__(self, update_available: bool, newest_version: str, release_notes: str):
+        """Updater constructor."""
         self.update_available = update_available
         self.release_notes = release_notes
         self.newest_version = newest_version
diff --git a/homeassistant/components/updater/binary_sensor.py b/homeassistant/components/updater/binary_sensor.py
index 6c39e49f8b7..b883d060d6e 100644
--- a/homeassistant/components/updater/binary_sensor.py
+++ b/homeassistant/components/updater/binary_sensor.py
@@ -1,5 +1,6 @@
 """Support for Home Assistant Updater binary sensors."""
 
+from homeassistant.core import callback
 from homeassistant.components.binary_sensor import BinarySensorDevice
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
@@ -58,7 +59,8 @@ class UpdaterBinary(BinarySensorDevice):
             data[ATTR_NEWEST_VERSION] = self._newest_version
         return data
 
-    async def async_added_to_hass(self):
+    @callback
+    def async_added_to_hass(self):
         """Register update dispatcher."""
 
         async def async_state_update(updater: Updater):