diff --git a/projekte/attiny13/blink.asm b/projekte/attiny13/blink.asm
index 5930c14..6250f6a 100644
--- a/projekte/attiny13/blink.asm
+++ b/projekte/attiny13/blink.asm
@@ -1,17 +1,25 @@
 .INCLUDE "tn13def.inc"
 
+; data direction = output
 	sbi DDRB, 1 ; PB1
+
 loop:
+
+; clear bit
 	cbi PORTB, 1
 
+; wait
 loop1:
  	sbiw ZL, 1
 	brne loop1
 
+; set bit
 	sbi PORTB, 1
 
+; wait
 loop2:
 	sbiw ZL, 1
 	brne loop2
 
+; again! again! again!
 	rjmp loop