diff --git a/avr/modules/com2/main.asm b/avr/modules/com2/main.asm
index 6fdaa72..3291beb 100644
--- a/avr/modules/com2/main.asm
+++ b/avr/modules/com2/main.asm
@@ -288,7 +288,7 @@ com2ReceivePacket_bufferAvailable:
   push xl
     push xh
       lds r16, com2Address
-      ldi r17, (COM2_BUFFER_SIZE-3)      
+      ldi r17, (COM2_BUFFER_SIZE-3)      ; buffer size minus dst addr, payload len, crc byte
       rcall com2ReceivePacketRaw
     pop xh
   pop xl