diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 1442b6a0..3cfa953f 100644
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -274,10 +274,73 @@
- This describes the memory layout of an individual pixel.
+ This describes the memory layout of an individual pixel.
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+ All renderers should support argb8888 and xrgb8888 but any other
+ formats are optional and may not be supported by the particular
+ renderer in use.
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