diff --git a/README.md b/README.md
index b0aca90..f166524 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,6 @@ hardware auto clicker using an arduino leonardo
 
 basically just listen for commands on a serial port then click, plus a program that sends these commands
 
+the "client" assumes serial port COM6 and a speed of 9600 by default
+
 https://www.youtube.com/watch?v=NCfYwzbwbNo