diff --git a/README.md b/README.md
index c8f7eeab..112ef7dc 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,13 @@ Screenshot | Screenshot
 
 ## Try this game 
 [http://cloudretro.io](http://cloudretro.io)
+- On Desktop: 
+..- Arrow keys + Z(A) + X(B) + C(X) + V(Y) + Shift(Select) + Enter(Start)
+..- S(Save) + A(Load) + F(Full screen)
+..\*A(B) means they key A on keyboard is equivalent to key B in emulator
+- On Mobile:
+..- Just follow the UI.
+..- Only Android with latest chrome version can work for  the service
 
 ## Feature
 1. Cloud gaming: Game logic and storage is hosted on cloud service. It reduces the cumbersome of game initialization.