diff --git a/C64_1351_Mouse/README.md b/C64_1351_Mouse/README.md
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+C:\Users\xxxxx\Documents\Arduino\libraries\USB_Host_Shield_Library_2.0\UsbCore.h:
+//Arduino Pro Micro SS -> A0, INT -> A1:
+typedef MAX3421e<P18, P19> MAX3421E;