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-rw-r--r--docs/formats.md7
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diff --git a/docs/formats.md b/docs/formats.md
index cddfe027..2b75d31a 100644
--- a/docs/formats.md
+++ b/docs/formats.md
@@ -138,3 +138,10 @@ Some are channel order agnostic (e.g. ARGBScale).
Some functions are symmetric (e.g. ARGBToBGRA is the same as BGRAToARGB, so its a macro).
ARGBBlend expects preattenuated ARGB. The R,G,B are premultiplied by alpha. Other functions don't care.
+
+# RGB24 and RAW
+
+There are 2 RGB layouts - RGB24 (aka 24BG) and RAW
+
+RGB24 is B,G,R in memory
+RAW is R,G,B in memory