Update README.md

README.md

@@ -164,6 +164,8 @@ reload | true | ```{"reload": true}``` | Reloads the current page immediately
 url | URL | ```{"url": "http://<url>"}``` | Browse to a new URL immediately
 wake | true | ```{"wake": true}``` | Wakes the screen if it is asleep
 speak | data | ```{"speak": "Hello!"}``` | Uses the devices TTS to speak the message
+brightness | data | ```{"brightness": 1}``` | Changes the screens brightness, value 1-255. 
+
 
 * The base topic value (default is "mywallpanel") should be unique to each device running the application unless you want all devices to receive the same command. The base topic and can be changed in the application settingssettings.
 * Commands are constructed via valid JSON. It is possible to string multiple commands together: