diff --git a/interrupts/crc/lay1+2.c b/interrupts/crc/lay1+2.c
index 64880ee55a120bee107635b04cab3dca8e8ab39a..ac13c548ad1bff4f217980deeaa458aee244460b 100644
--- a/interrupts/crc/lay1+2.c
+++ b/interrupts/crc/lay1+2.c
@@ -104,7 +104,7 @@ int main(void){
             if(readyToReceive){
                 if(bufferIndex != 0) receivedFrame[receiveIndex] = frame[bufferIndex-1];
                 else receivedFrame[receiveIndex] = frame[MAXFRAMESIZE-1];
-
+                printf("receivedFrame[%d] = %d, bufferIndex: %d \n", receiveIndex, receivedFrame[receiveIndex], bufferIndex);
                 switch(receiveIndex){
                     case 0:
                         if(receivedFrame[receiveIndex] != 0x7E) break;