rwm: window may never set app-id/title

 protocol/river-window-management-v1.xml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/protocol/river-window-management-v1.xml b/protocol/river-window-management-v1.xml
index 6ca7a1b..68341bc 100644
--- a/protocol/river-window-management-v1.xml
+++ b/protocol/river-window-management-v1.xml
@@ -299,6 +299,8 @@
       <description summary="the window set an application ID">
         The window set an application ID.
 
+        This event may never be sent if the window never sets an application ID.
+
         This event is double-buffered state and will be followed by a
         river_window_manager_v1.update event.
       </description>
@@ -309,6 +311,8 @@
       <description summary="the window set a title">
         The window set a title.
 
+        This event may never be sent if the window never sets a title.
+
         This event is double-buffered state and will be followed by a
         river_window_manager_v1.update event.
       </description>