diff --git a/C64_joystick_atmelstudio/README.md b/C64_joystick_atmelstudio/README.md
index c9bf646..ad6a0c1 100644
--- a/C64_joystick_atmelstudio/README.md
+++ b/C64_joystick_atmelstudio/README.md
@@ -6,7 +6,7 @@
 - RIGHT(4) -> 15(PB1)
 - BTN1(6) -> 9(PB5)
 - BTN2(9, MSX 7) -> 8(PB4) (optional)
-- GND(8) -> GND(PB4)
+- GND(8) -> GND
 
 ## Firmware/flashing
 - Install Arduino IDE