diff --git a/homeassistant/components/mobile_app/binary_sensor.py b/homeassistant/components/mobile_app/binary_sensor.py
index 58683ef378c..e19e00b1277 100644
--- a/homeassistant/components/mobile_app/binary_sensor.py
+++ b/homeassistant/components/mobile_app/binary_sensor.py
@@ -69,7 +69,7 @@ async def async_setup_entry(
 
 
 class MobileAppBinarySensor(MobileAppEntity, BinarySensorEntity):
-    """Representation of an mobile app binary sensor."""
+    """Representation of a mobile app binary sensor."""
 
     async def async_restore_last_state(self, last_state: State) -> None:
         """Restore previous state."""
diff --git a/homeassistant/components/mobile_app/entity.py b/homeassistant/components/mobile_app/entity.py
index f1f7b592621..a0ad4c45963 100644
--- a/homeassistant/components/mobile_app/entity.py
+++ b/homeassistant/components/mobile_app/entity.py
@@ -1,4 +1,4 @@
-"""A entity class for mobile_app."""
+"""An entity class for mobile_app."""
 
 from __future__ import annotations
 
@@ -24,7 +24,7 @@ from .helpers import device_info
 
 
 class MobileAppEntity(RestoreEntity):
-    """Representation of an mobile app entity."""
+    """Representation of a mobile app entity."""
 
     _attr_should_poll = False
 
diff --git a/homeassistant/components/mobile_app/sensor.py b/homeassistant/components/mobile_app/sensor.py
index dd70cf1e22e..74d8e25f764 100644
--- a/homeassistant/components/mobile_app/sensor.py
+++ b/homeassistant/components/mobile_app/sensor.py
@@ -78,7 +78,7 @@ async def async_setup_entry(
 
 
 class MobileAppSensor(MobileAppEntity, RestoreSensor):
-    """Representation of an mobile app sensor."""
+    """Representation of a mobile app sensor."""
 
     async def async_restore_last_state(self, last_state: State) -> None:
         """Restore previous state."""