From 2fe0cbbb19df504723934f39473064033c64ef6f Mon Sep 17 00:00:00 2001
From: Rangi <remy.oukaour+rangi42@gmail.com>
Date: Wed, 24 Mar 2021 18:34:33 -0400
Subject: [PATCH] Add some comments regarding 16-bit increment/decrement

---
 audio/engine.asm             |  2 ++
 engine/gfx/pic_animation.asm | 10 ++++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/audio/engine.asm b/audio/engine.asm
index fa3a08297..ca6fd4ab7 100644
--- a/audio/engine.asm
+++ b/audio/engine.asm
@@ -982,6 +982,7 @@ ApplyPitchSlide:
 	add hl, bc
 	add [hl]
 	ld [hl], a
+	; could have done "jr nc, .no_rollover / inc de / .no_rollover"
 	ld a, 0
 	adc e
 	ld e, a
@@ -1022,6 +1023,7 @@ ApplyPitchSlide:
 	ld a, [hl]
 	add a
 	ld [hl], a
+	; could have done "jr nc, .no_rollover / dec de / .no_rollover"
 	ld a, e
 	sbc 0
 	ld e, a
diff --git a/engine/gfx/pic_animation.asm b/engine/gfx/pic_animation.asm
index 62d9ad6d7..d3a176f29 100644
--- a/engine/gfx/pic_animation.asm
+++ b/engine/gfx/pic_animation.asm
@@ -628,14 +628,16 @@ PokeAnim_ConvertAndApplyBitmask:
 	call AddNTimes
 	ld a, [wBoxAlignment]
 	and a
-	jr nz, .go
+	jr nz, .subtract
+	; hl += [wPokeAnimBitmaskCurCol]
 	ld a, [wPokeAnimBitmaskCurCol]
 	ld e, a
 	ld d, 0
 	add hl, de
-	jr .skip2
+	jr .done
 
-.go
+.subtract
+	; hl -= [wPokeAnimBitmaskCurCol]
 	ld a, [wPokeAnimBitmaskCurCol]
 	ld e, a
 	ld a, l
@@ -645,7 +647,7 @@ PokeAnim_ConvertAndApplyBitmask:
 	sbc 0
 	ld h, a
 
-.skip2
+.done
 	ret
 
 .UnusedSizeData: ; unreferenced