diff --git a/kulifuli-arduino.ino b/kulifuli-arduino.ino
index e2ed9d5..8fd4563 100644
--- a/kulifuli-arduino.ino
+++ b/kulifuli-arduino.ino
@@ -64,6 +64,8 @@ void loop () {
   if ( Serial . available () ) {
     int input = Serial . read () ;
 
+    // In order to avoid serial writes by software other than kulifuli-host messing things up,
+    // we check for a specific sequence of 8 bytes before the byte that contains the new duty cycle
     if (
       seqPos == 0 && input == 188 ||
       seqPos == 1 && input == 92 ||
@@ -77,7 +79,7 @@ void loop () {
       // Advance in the sequence
       seqPos ++ ;
     } else if ( seqPos == 8 ) {
-      // `input` is the new duty cycle
+      // Sequence completed, `input` is the new duty cycle
       OCR1AL = input ;
       OCR1BL = input ;
       Serial . write (input) ;