diff --git a/module01/ex00/main.c b/module01/ex00/main.c
index ed512c0..6c0f9b1 100644
--- a/module01/ex00/main.c
+++ b/module01/ex00/main.c
@@ -57,9 +57,9 @@ int main() {
 											//   -> prescale values : 16.11.2 TCCR1B – Timer/Counter1 Control Register B, table 16-5. Clock Select Bit Description
 
 	while(1) {
-		if ( TCNT1 >= TIME_MS(500)) {
+		if ( TCNT1 >= TIME_MS(500)) {		// read timer with register TCNT1 (read/write allowed), that combines two 8 bits registers : 16.11.4 TCNT1H and TCNT1L – Timer/Counter1
 			TOGGLE_LED(D2);
-			TCNT1 = 0;						// reset timer value
+			TCNT1 = 0;						// reset timer value, also in register TCNT1
 		}
 	}
 }