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-rw-r--r--X11/extensions/XIproto.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/X11/extensions/XIproto.txt b/X11/extensions/XIproto.txt
index 20cc02a03..f9d19f09d 100644
--- a/X11/extensions/XIproto.txt
+++ b/X11/extensions/XIproto.txt
@@ -577,7 +577,9 @@
already has the device open with a different mode. It will fail
and return AlreadyGrabbed if another client has the device
grabbed. The request will fail with a BadMatch error if the
- requested mode is not supported by the device.
+ device has no valuators and reports no axes of motion. The
+ request will fail with a BadMode error if the requested mode
+ is not supported by the device.
SetDeviceMode
device:DEVICE