added note about changing clock correction value

Author: CppBaddy

README.md

@@ -8,7 +8,7 @@ for backup Li-ion 18650 type battery.
 
 Display is TM1637 7-segment LED i2c module
 
-Fine clock calibration can be achieved by changing daily/weekly correction values in source code.
+Fine clock calibration can be achieved by changing weekly correction value: hold Snoose + Alarm + Hours/Minutes to decrease/increase value.
 
 ![atmegaClock schematics](https://github.com/CppBaddy/atmegaClock/blob/main/schematics.png?raw=true)