diff --git a/RetroJoystickAdapter_WiiClassicController.ino b/RetroJoystickAdapter_WiiClassicController.ino
index 36ab17d..5932535 100644
--- a/RetroJoystickAdapter_WiiClassicController.ino
+++ b/RetroJoystickAdapter_WiiClassicController.ino
@@ -1,3 +1,6 @@
+//Uno: SDA = A4, SCL = A5
+//Pro Micro: SDA = D2, SCL= D3
+
 //================================================================================
 //================================================================================
 //  Joystick (Gamepad)