From 2b1dc69497f0c3a814296e1a368b2f18b6e89847 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Mon, 27 Feb 2017 23:53:21 +0900
Subject: [PATCH] graphics: Document bug fix: DrawImage

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

diff --git a/image.go b/image.go
index 76387819c..9eaddb045 100644
--- a/image.go
+++ b/image.go
@@ -177,7 +177,9 @@ func (i *Image) Fill(clr color.Color) error {
 //     ColorM:        Identity matrix (that changes no colors)
 //     CompositeMode: CompositeModeSourceOver (regular alpha blending)
 //
-// Note that this function returns immediately and actual drawing is done lazily.
+// For drawing, the pixels of the argument image at the time of this call is adopted.
+// Even if the argument image is mutated after this call,
+// the drawing result is never affected.
 //
 // This function is concurrent-safe.
 func (i *Image) DrawImage(image *Image, options *DrawImageOptions) error {