diff --git a/homeassistant/components/device_tracker/tomato.py b/homeassistant/components/device_tracker/tomato.py
index 265dcf84b57..1a189a08396 100644
--- a/homeassistant/components/device_tracker/tomato.py
+++ b/homeassistant/components/device_tracker/tomato.py
@@ -1,4 +1,41 @@
-""" Supports scanning a Tomato router. """
+"""
+homeassistant.components.device_tracker.tomato
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Device tracker platform that supports scanning a Tomato router for device
+presence.
+
+Configuration:
+
+To use the Tomato tracker you will need to add something like the following
+to your config/configuration.yaml
+
+device_tracker:
+  platform: tomato
+  host: YOUR_ROUTER_IP
+  username: YOUR_ADMIN_USERNAME
+  password: YOUR_ADMIN_PASSWORD
+  http_id: ABCDEFG
+
+Variables:
+
+host
+*Required
+The IP address of your router, e.g. 192.168.1.1.
+
+username
+*Required
+The username of an user with administrative privileges, usually 'admin'.
+
+password
+*Required
+The password for your given admin account.
+
+http_id
+*Required
+The value can be obtained by logging in to the Tomato admin interface and
+search for http_id in the page source code.
+"""
 import logging
 import json
 from datetime import timedelta