diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 9418c62f..9db9181a 100644
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -1588,6 +1588,11 @@
 	surface is not visible in any way, e.g. the surface is off-screen,
 	or completely obscured by other opaque surfaces.
 
+	When a frame request is signaled, all other not-yet-signaled frame
+	requests from applied content updates of the surface are also signaled.
+	Clients should therefore only submit a single frame request for a
+	surface at a time.
+
 	The object returned by this request will be destroyed by the
 	compositor after the callback is fired and as such the client must not
 	attempt to use it after that point.