diff --git a/ArduCopter/defines.h b/ArduCopter/defines.h
index f249e7e035..59846aa573 100644
--- a/ArduCopter/defines.h
+++ b/ArduCopter/defines.h
@@ -371,7 +371,6 @@ enum FlipState {
 #define ERROR_CODE_CRASH_CHECK_LOSS_OF_CONTROL 2
 // subsystem specific error codes -- flip
 #define ERROR_CODE_FLIP_ABANDONED           2
-// subsystem specific error codes -- autotune
 
 // parachute failed to deploy because of low altitude or landed
 #define ERROR_CODE_PARACHUTE_TOO_LOW        2