diff --git a/avr/modules/com2w/com2w.asm b/avr/modules/com2w/com2w.asm
index 56988d3..6b21a92 100644
--- a/avr/modules/com2w/com2w.asm
+++ b/avr/modules/com2w/com2w.asm
@@ -324,7 +324,7 @@ com2wSendByte_send1:
     rcall com2wDataSetHigh
 com2wSendByte_sent:
     Utils_WaitNanoSecs 5000, 0, r22             ; wait for very short time to ensure data is stable when clock rises
-    push r15
+    push r15                               ; TODO: check this (doesn't really ensure short HIGH time!)
       in r15, SREG
       cli                                       ; ensure time period by disabling irqs
       rcall com2wClkSetHigh