protocol: Clarify pointer axis event

Pointer axis events are in the same coordinate space as motion events.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>

diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 07fee80..48a0d77 100644 (file)
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -987,7 +987,10 @@
 
     <event name="axis">
       <description summary="axis event">
-       Scroll and other axis notifications.
+       Scroll and other axis notifications.  The value parameter
+       is the length of a vector along an axis in a coordinate space
+       identical to those of motion events, representing the relative
+       movement along an axis.
       </description>
 
       <arg name="time" type="uint"/>