Update README.md

README.md

@@ -3,6 +3,6 @@ An Arduino based sweeper for ham radio homebrewing, created by Ashar Farhan.
 This is based on an Arduino and AD8307 based W7ZOI power meter and either an Si570 or an Si5351.
 
 My fork allows usage of the more modern Si5351 library that can be installed directly from the Arduino IDE. 
-Also, modifications have been made to use a rotary encoder for tuning, rather than a potentiometer. 
+Also, modifications have been made to use a rotary encoder on pins 2 and 3 for tuning, rather than a potentiometer as in the original design. 
 
 The original circuit details are avaiable on http://hfsignals.blogspot.in