diff --git a/proto/protocol.xml b/proto/protocol.xml
index dbb11ff..1b8cc62 100644
--- a/proto/protocol.xml
+++ b/proto/protocol.xml
@@ -1355,9 +1355,14 @@
 
     <event name="modifiers" since="1">
       <description summary="Modifier change event">
-        Notification that the EIS implementation has changed modifier
-        states on this device. Future ei_keyboard.key requests must take the
-        new modifier state into account.
+        Notification that the EIS implementation has changed group or modifier
+        states on this device, but not necessarily in response to an
+        ei_keyboard.key event. Future ei_keyboard.key requests must take the
+        new group or modifier state into account.
+
+        This event should not be sent in response to ei_keyboard.key events
+        that change the group or modifier state according to the keymap. The
+        client is expected to track such group or modifier states on its own.
 
         A client must assume that all modifiers are lifted when it
         receives an ei_device.paused event. The EIS implementation