diff --git a/homeassistant/components/simple_alarm.py b/homeassistant/components/simple_alarm.py
index 5e3c125c317..e29659f3c5b 100644
--- a/homeassistant/components/simple_alarm.py
+++ b/homeassistant/components/simple_alarm.py
@@ -34,6 +34,7 @@ def setup(hass, config):
 
     device_tracker = loader.get_component('device_tracker')
     light = loader.get_component('light')
+    notify = loader.get_component('notify')
 
     light_ids = []
 
@@ -67,6 +68,10 @@ def setup(hass, config):
             hass, unknown_light_id,
             flash=light.FLASH_LONG, rgb_color=[255, 0, 0])
 
+        # Send a message to the user
+        notify.send_message(
+            hass, "The lights just got turned on while no one was home.")
+
     # Setup services to test the effect
     hass.services.register(
         DOMAIN, SERVICE_TEST_KNOWN_ALARM, lambda call: known_alarm())