diff --git a/examples/sprites/main.go b/examples/sprites/main.go
index 83a89e20d..e693dcf75 100644
--- a/examples/sprites/main.go
+++ b/examples/sprites/main.go
@@ -131,7 +131,9 @@ func update(screen *ebiten.Image) error {
 	msg := fmt.Sprintf(`FPS: %0.2f
 Num of sprites: %d
 Press <- or -> to change the number of sprites`, ebiten.CurrentFPS(), sprites.Len())
-	ebitenutil.DebugPrint(screen, msg)
+	if err := ebitenutil.DebugPrint(screen, msg); err != nil {
+		return err
+	}
 	return nil
 }
 
diff --git a/pixels.go b/pixels.go
index b294ebca5..e6d86f15f 100644
--- a/pixels.go
+++ b/pixels.go
@@ -1,4 +1,4 @@
-// Copyright 2016 Hajime Hoshi
+// Copyright 2016 The Ebiten Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.