diff --git a/homeassistant/components/ads.py b/homeassistant/components/ads.py
index d8fe1ab1e21..3528a2b0f76 100644
--- a/homeassistant/components/ads.py
+++ b/homeassistant/components/ads.py
@@ -121,6 +121,7 @@ class AdsHub:
     """Representation of a PyADS connection."""
 
     def __init__(self, ads_client, poll_interval, use_notify):
+        """Initialize the ADS Hub."""
         self.poll_interval = poll_interval
         self.use_notify = use_notify
 
@@ -180,7 +181,7 @@ class AdsHub:
         )
 
     def _device_notification_callback(self, addr, notification, huser):
-        """Callback for device notifications."""
+        """Handle device notifications."""
         from pyads import PLCTYPE_BOOL, PLCTYPE_INT, PLCTYPE_BYTE, PLCTYPE_UINT
         contents = notification.contents
 
diff --git a/homeassistant/components/binary_sensor/ads.py b/homeassistant/components/binary_sensor/ads.py
index 015bfc75431..4db78710dba 100644
--- a/homeassistant/components/binary_sensor/ads.py
+++ b/homeassistant/components/binary_sensor/ads.py
@@ -1,7 +1,5 @@
-"""
-Support for ADS binary sensors.
+"""Support for ADS binary sensors."""
 
-"""
 import logging
 from datetime import timedelta
 
@@ -32,7 +30,7 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
 
 
 def setup_platform(hass, config, add_devices, discovery_info=None):
-    """ Set up the Binary Sensor platform for ADS. """
+    """Set up the Binary Sensor platform for ADS."""
     ads_hub = hass.data.get(DATA_ADS)
     if not ads_hub:
         return False
@@ -60,6 +58,7 @@ class AdsBinarySensor(BinarySensorDevice):
 
     def __init__(self, ads_hub, name, adsvar, device_class, use_notify,
                  poll_interval):
+        """Initialize AdsBinarySensor entity."""
         self._name = name
         self._state = False
         self._device_class = device_class or 'moving'
diff --git a/homeassistant/components/light/ads.py b/homeassistant/components/light/ads.py
index 54662f80424..b753458d16c 100644
--- a/homeassistant/components/light/ads.py
+++ b/homeassistant/components/light/ads.py
@@ -1,6 +1,5 @@
-"""
-Support for ADS light sources.
-"""
+"""Support for ADS light sources."""
+
 import logging
 import math
 
@@ -42,6 +41,7 @@ class AdsLight(Light):
     """Representation of ADS light."""
 
     def __init__(self, ads_hub, varname_enable, varname_brightness, devname):
+        """Initialize AdsLight entity."""
         self._ads_hub = ads_hub
         self._on_state = False
         self._brightness = 50
@@ -52,7 +52,7 @@ class AdsLight(Light):
 
     @property
     def name(self):
-        """ Return the name of the device if any. """
+        """Return the name of the device if any."""
         return self._devname
 
     @property
@@ -68,7 +68,7 @@ class AdsLight(Light):
 
     @property
     def is_on(self):
-        """ If light is on. """
+        """If light is on."""
         return self._on_state
 
     @property
diff --git a/homeassistant/components/sensor/ads.py b/homeassistant/components/sensor/ads.py
index d571adebac1..38ba3340910 100644
--- a/homeassistant/components/sensor/ads.py
+++ b/homeassistant/components/sensor/ads.py
@@ -1,7 +1,5 @@
-"""
-Support for ADS sensors.__init__.py
+"""Support for ADS sensors."""
 
-"""
 import logging
 from datetime import timedelta
 import voluptuous as vol
@@ -64,6 +62,7 @@ class AdsSensor(Entity):
 
     def __init__(self, ads_hub, adsvar, adstype, devname, unit_of_measurement,
                  use_notify, poll_interval, factor):
+        """Initialize AdsSensor entity."""
         self._ads_hub = ads_hub
         self._name = devname
         self._value = 0
@@ -80,15 +79,17 @@ class AdsSensor(Entity):
 
     @property
     def name(self):
+        """Return the name of the entity."""
         return self._name
 
     @property
     def state(self):
-        """ Return the state of the device. """
+        """Return the state of the device."""
         return self._value
 
     @property
     def unit_of_measurement(self):
+        """Return the unit of measurement."""
         return self._unit_of_measurement
 
     def callback(self, name, value):
diff --git a/homeassistant/components/switch/ads.py b/homeassistant/components/switch/ads.py
index edd96273ac0..3c9c32b9a8e 100644
--- a/homeassistant/components/switch/ads.py
+++ b/homeassistant/components/switch/ads.py
@@ -1,7 +1,5 @@
-"""
-Support for ADS switch platform.
+"""Support for ADS switch platform."""
 
-"""
 import logging
 
 import voluptuous as vol
@@ -35,9 +33,10 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
 
 
 class AdsSwitch(ToggleEntity):
-    """ Representation of an Ads switch device. """
+    """Representation of an Ads switch device."""
 
     def __init__(self, ads_hub, dev_name, ads_var):
+        """Initialize the AdsSwitch entity."""
         self._ads_hub = ads_hub
         self._on_state = False
         self.dev_name = dev_name
@@ -45,24 +44,28 @@ class AdsSwitch(ToggleEntity):
 
     @property
     def is_on(self):
+        """Return if the switch is turned on."""
         return self._on_state
 
     @property
     def name(self):
+        """Return the name of the entity."""
         return self.dev_name
 
     def turn_on(self, **kwargs):
+        """Turn the switch on."""
         self._ads_hub.write_by_name(self.ads_var, True,
                                     self._ads_hub.PLCTYPE_BOOL)
         self._on_state = True
 
     def turn_off(self, **kwargs):
+        """Turn the switch off."""
         self._ads_hub.write_by_name(self.ads_var, False,
                                     self._ads_hub.PLCTYPE_BOOL)
         self._on_state = False
 
     def value_changed(self, val):
-        """Handle changed state change."""
+        """Handle changed state."""
         self._on_state = val
         self.schedule_update_ha_state()