master 796bb6f1e7: * commands.texi (Misc Events): Update description of wheel events.

[Po Lu]

branch: master
commit 796bb6f1e707cc5086ae9dbb6395f7a35554c63d
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    * commands.texi (Misc Events): Update description of wheel events.
---
 doc/lispref/commands.texi | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/doc/lispref/commands.texi b/doc/lispref/commands.texi
index a1628eabaa..a4ae68af5b 100644
--- a/doc/lispref/commands.texi
+++ b/doc/lispref/commands.texi
@@ -2091,11 +2091,13 @@ wheel.
 
 @vindex mouse-wheel-up-event
 @vindex mouse-wheel-down-event
-This kind of event is generated only on some kinds of systems.  On some
-systems, @code{mouse-4} and @code{mouse-5} are used instead.  For
-portable code, use the variables @code{mouse-wheel-up-event} and
-@code{mouse-wheel-down-event} defined in @file{mwheel.el} to determine
-what event types to expect for the mouse wheel.
+This kind of event is generated only on some kinds of systems.  On
+some systems, @code{mouse-4} and @code{mouse-5} are used instead.  For
+portable code, use the variables @code{mouse-wheel-up-event},
+@code{mouse-wheel-up-alternate-event}, @code{mouse-wheel-down-event}
+and @code{mouse-wheel-down-alternate-event} defined in
+@file{mwheel.el} to determine what event types to expect for the mouse
+wheel.
 
 @cindex @code{pinch} event
 @item (pinch @var{position} @var{dx} @var{dy} @var{scale} @var{angle})