diff --git a/libburn/libburn.h b/libburn/libburn.h
index 0fc562f..11c2a98 100644
--- a/libburn/libburn.h
+++ b/libburn/libburn.h
@@ -80,6 +80,8 @@ struct burn_track;
 /** Track mode - audio
     2352 bytes per sector.  may be | with 4ch or preemphasis.
     NOT TO BE CONFUSED WITH BURN_MODE_RAW
+    Audio data must be 44100Hz 16bit stereo with no riff or other header at
+    beginning.  Extra header data will cause pops or clicks.
 */
 #define BURN_AUDIO		(1 << 6)
 /** Track mode modifier - 4 channel audio. */