diff --git a/XI2.h b/XI2.h
index 40a9faf..29ffdd1 100644
--- a/XI2.h
+++ b/XI2.h
@@ -146,6 +146,7 @@
 /* Device event flags (key events only) */
 #define XIKeyRepeat                             (1 << 16)
 /* Device event flags (pointer events only) */
+#define XIPointerEmulated                       (1 << 16)
 
 /* XI2 event mask macros */
 #define XISetMask(ptr, event)   (((unsigned char*)(ptr))[(event)>>3] |=  (1 << ((event) & 7)))
diff --git a/specs/XI2proto.txt b/specs/XI2proto.txt
index 8736b18..5d50b45 100644
--- a/specs/XI2proto.txt
+++ b/specs/XI2proto.txt
@@ -1526,7 +1526,7 @@ For a detailed description of classes, see the XIQueryDevice request.
 
     DEVICEEVENTFLAGS (all events): none
     DEVICEEVENTFLAGS (key events only): { KeyRepeat }
-    DEVICEEVENTFLAGS (pointer events only): none
+    DEVICEEVENTFLAGS (pointer events only): { PointerEmulated }
 
 An XIDeviceEvent is generated whenever the logical state of a device
 changes in response to a button press, a button release, a motion, a key
@@ -1571,6 +1571,9 @@ KeyRelease, ButtonPress, ButtonRelease, Motion.
         KeyRepeat means that this event is for repeating purposes, and
         the physical state of the key has not changed.  This is only
         valid for KeyPress events.
+        PointerEmulated signals that the event has been emulated from another
+        XI 2.x event for legacy client support, and that this event should
+        be ignored if the client listens for these events.
 
 Modifier state in mods is detailed as follows: