diff --git a/docs/apps.rst b/docs/apps.rst
index b8fc67c..88ef2d4 100644
--- a/docs/apps.rst
+++ b/docs/apps.rst
@@ -43,6 +43,13 @@ It can be enabled by modifying ``main.py``.
 Integration
 -----------
 
+.. automodule:: apps.alarm
+
+This app is enabled by default in the simulator.
+The app is also frozen into the firmware image but it is disabled by
+default in order to keep RAM available for user developed applications.
+It can be enabled by modifying ``main.py``.
+
 .. automodule:: apps.musicplayer
 
 This app is enabled by default in the simulator.
diff --git a/wasp/boards/manifest_240x240.py b/wasp/boards/manifest_240x240.py
index c99fdb8..e2febbf 100644
--- a/wasp/boards/manifest_240x240.py
+++ b/wasp/boards/manifest_240x240.py
@@ -3,6 +3,7 @@
 """Shared manifest for applications that work well on a 240x240 display."""
 
 manifest = (
+    'apps/alarm.py',
     'apps/clock.py',
     'apps/flashlight.py',
     'apps/gameoflife.py',
diff --git a/wasp/boards/simulator/main.py b/wasp/boards/simulator/main.py
index eee57d4..fb7698b 100644
--- a/wasp/boards/simulator/main.py
+++ b/wasp/boards/simulator/main.py
@@ -3,6 +3,9 @@
 
 import wasp
 
+from apps.alarm import AlarmApp
+wasp.system.register(AlarmApp())
+
 from apps.fibonacci_clock import FibonacciClockApp
 wasp.system.register(FibonacciClockApp())