From 01ed3b18cc8c28038e5df8760eb141748538d587 Mon Sep 17 00:00:00 2001
From: sfam <sfam21@gmail.com>
Date: Sat, 22 Aug 2015 14:57:57 +0100
Subject: [PATCH] update docstring

---
 homeassistant/components/sensor/mqtt.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/homeassistant/components/sensor/mqtt.py b/homeassistant/components/sensor/mqtt.py
index b6c7a7b4ea1..d5dc192e450 100644
--- a/homeassistant/components/sensor/mqtt.py
+++ b/homeassistant/components/sensor/mqtt.py
@@ -67,6 +67,7 @@ class MqttSensor(Entity):
         self._unit_of_measurement = unit_of_measurement
 
         def message_received(topic, payload, qos):
+            """ A new MQTT message has been received. """
             self._state = payload
             self.update_ha_state()