diff --git a/avr/apps/ma_light/README b/avr/apps/ma_light/README
index ba66cc5..930f315 100644
--- a/avr/apps/ma_light/README
+++ b/avr/apps/ma_light/README
@@ -3,6 +3,16 @@ App for Motion Activated Light
 ==============================
 ==============================
 
+This app listens for VALUE_REPORT messages on the bus. If a preselected value from a preselected node
+is received (with a value !=0) the LED stripe attached to the node which runs this app will be turned on in
+the preselected color for a preselected time. If in this time another matching message is received the
+light timer gets restarted. If no matching message is received within the preselected time the light is
+turned off again.
+
+Typical usage is to watch for a motion message from some node with a motion sensor and react to that.
+This app can watch for up to two node-value pairs.
+
+
 
 1. Values
 ======