update dox
TBR=
NOTRY=True
Author: reed@google.com
Review URL: https://codereview.chromium.org/352873003
diff --git a/include/core/SkImageInfo.h b/include/core/SkImageInfo.h
index b955433..17e1228 100644
--- a/include/core/SkImageInfo.h
+++ b/include/core/SkImageInfo.h
@@ -67,6 +67,10 @@
/**
* Describes how to interpret the components of a pixel.
+ *
+ * kN32_SkColorType is an alias for whichever 32bit ARGB format is the "native"
+ * form for skia's blitters. Use this if you don't have a swizzle preference
+ * for 32bit pixels.
*/
enum SkColorType {
kUnknown_SkColorType,