wl_surface: clarify the base of time passed in the callback of frame

Signed-off-by: Ryo Munakata <ryomnktml@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 2d57f69..bb457bc 100644 (file)
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -1100,7 +1100,7 @@
        attempt to use it after that point.
 
        The callback_data passed in the callback is the current time, in
-       milliseconds.
+       milliseconds, with an undefined base.
       </description>
 
       <arg name="callback" type="new_id" interface="wl_callback"/>