From 2e0b7da614844cf4ec9d55832843f5c0efdb23da Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Tue, 26 Jul 2016 12:17:15 +0900
Subject: [PATCH] grahics: Add comments

---
 imageimpl.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/imageimpl.go b/imageimpl.go
index 0ff46dd81..5f4a2ae87 100644
--- a/imageimpl.go
+++ b/imageimpl.go
@@ -229,11 +229,13 @@ func (i *imageImpl) resetPixelsIfNeeded(target *imageImpl, context *opengl.Conte
 	if i.pixels == nil {
 		return nil
 	}
+	// target is an image begin tried to mutate.
+	// If pixels object is related to that image, the pixels must be reset.
 	if !i.pixels.NeedsReset(target.image) {
 		return nil
 	}
 	if context == nil {
-		// context is null when this is not initialized yet.
+		// context is nil when this is not initialized yet.
 		i.pixels = nil
 		return nil
 	}