rwm: expand on river_output_v1 event timing

 protocol/river-window-management-v1.xml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/protocol/river-window-management-v1.xml b/protocol/river-window-management-v1.xml
index 91a2365..ea5a97b 100644
--- a/protocol/river-window-management-v1.xml
+++ b/protocol/river-window-management-v1.xml
@@ -895,6 +895,9 @@
         logical coordinate space. The x and y coordinates may be positive or
         negative.
 
+        This event is sent once when the river_output_v1 is created and again
+        whenever the position changes.
+
         This event is double-buffered state and will be followed by a
         river_window_manager_v1.update event.
 
@@ -912,6 +915,9 @@
         logical coordinate space. The width and height will always be strictly
         greater than zero.
 
+        This event is sent once when the river_output_v1 is created and again
+        whenever the dimensions change.
+
         This event is double-buffered state and will be followed by a
         river_window_manager_v1.update event.