diff --git a/proto/protocol.xml b/proto/protocol.xml
index 5f20a37..00a1925 100644
--- a/proto/protocol.xml
+++ b/proto/protocol.xml
@@ -1338,7 +1338,7 @@
         description. The fd must be mapped with MAP_PRIVATE by
         the recipient, as MAP_SHARED may fail.
 
-        This event is sent immediately after the ei_keyboard object is created
+        This event is optional and only sent immediately after the ei_keyboard object is created
         and before the ei_device.done event. It is a protocol violation to send this
         event after the ei_device.done event.
       </description>