diff --git a/README.md b/README.md
index c5acc15..79671bb 100644
--- a/README.md
+++ b/README.md
@@ -3,10 +3,31 @@ ESP32 BLE remote control for ZhiJia (ZhiGuang) LED controllers.
 # Usage
 1. Flash firmware  to ESP32 devboard.
 3. Connect to BLER_AP WiFi access point (password: 12345678) and configure home network connection.
-4. Send GET requests to HTTP command endpoint: http://\<device ip\>/cmd/\<command name\>
+4. Send GET requests to HTTP command endpoint: http://\<device ip\>/cmd/\<command name\>\<room id: 0..9\>
     
-    For example, direct your browser to:
-    - http://bler.lan/cmd/bind
-    - http://bler.lan/cmd/on
-    - http://bler.lan/cmd/off
+# Binding
+To bind device to room 1:
+- Power off device.
+- Direct your browser to http://bler.lan/cmd/bind1 .
+- Simultaneously power on device.
+The device should blink several times to indicate successful binding.
        
+# Unbinding
+To unbind device use the same steps s for binding:
+- Power off device.
+- Direct your browser to http://bler.lan/cmd/unbind1 .
+- Simultaneously power on device.
+The device should blink several times to indicate successful binding.
+
+# Room 0
+To send command to all devices, use room id 0. For example, to put all light on, send GET request to http://bler.lan/cmd/on0
+
+# Available commands
+- bind - bind device to remote, to specific group (room)
+- unbind
+- on
+- off
+- a - put first LED channel to max brightness and second channel to zero
+- b - put second LED channel to max brightness and first channel to zero
+- ab - both LED cahnnels to max brightness
+- night