diff --git a/XBox360_XInput/RetroJoystickAdapter_PsxNewLib_NintendoEtensionCtrl_B360.ino b/XBox360_XInput/RetroJoystickAdapter_PsxNewLib_NintendoEtensionCtrl_B360.ino
index cce5d63..5a8ba03 100644
--- a/XBox360_XInput/RetroJoystickAdapter_PsxNewLib_NintendoEtensionCtrl_B360.ino
+++ b/XBox360_XInput/RetroJoystickAdapter_PsxNewLib_NintendoEtensionCtrl_B360.ino
@@ -1,4 +1,5 @@
 // https://github.com/SukkoPera/PsxNewLib
+// https://github.com/dmadison/NintendoExtensionCtrl
 // https://github.com/dmadison/ArduinoXInput
 
 #define XINPUT