diff --git a/extras b/extras
index 0e179893..be6d6c9c 160000
--- a/extras
+++ b/extras
@@ -1 +1 @@
-Subproject commit 0e1798937a4bf723813574281d0dc12c471c9199
+Subproject commit be6d6c9ce9a86231482eafacd4be867285809366
diff --git a/macros/audio_macros.asm b/macros/audio_macros.asm
index 6d7b45c8..d4914002 100755
--- a/macros/audio_macros.asm
+++ b/macros/audio_macros.asm
@@ -40,7 +40,7 @@ pitchenvelope: MACRO
 	ENDC
 ENDM
 
-;format: duty, volume, volume change, pitch
+;format: length [0, 15], volume [0, 15], volume change [-7, 7], pitch
 squarenote: MACRO
 	db $20 | \1
 	IF \3 < 0
@@ -51,7 +51,7 @@ squarenote: MACRO
 	dw \4
 ENDM
 
-;format: duty, volume, volume change, pitch
+;format: length [0, 15], volume [0, 15], volume change [-7, 7], pitch
 noisenote: MACRO
 	db $20 | \1
 	IF \3 < 0