diff --git a/C64_1351_Mouse/README.md b/C64_1351_Mouse/README.md
index b269bef..1dce17a 100644
--- a/C64_1351_Mouse/README.md
+++ b/C64_1351_Mouse/README.md
@@ -11,7 +11,7 @@ typedef MAX3421e<P18, P19> MAX3421E;
 
 #### Joystick port -> Arduino
 - 9 (POTX) -> 1k -> 9 (OC1A)
-- 9 (POTX) -> (ICP1) Arduino Pro Micro: 4, Arduino Uno: 8
+- 9 (POTX) -> Arduino Pro Micro: 4, Arduino Uno: 8 (ICP1)
 - 5 (POTY) -> 1k -> 10 (OC1B)
 - 6 (FIRE) -> 5
 - 1 (UP) -> 6