diff --git a/doc/lispref/commands.texi b/doc/lispref/commands.texi
index ed32814329b..1718978a395 100644
--- a/doc/lispref/commands.texi
+++ b/doc/lispref/commands.texi
@@ -2212,6 +2212,17 @@ and @code{mouse-wheel-down-alternate-event} defined in
 @file{mwheel.el} to determine what event types to expect for the mouse
 wheel.
 
+@vindex mouse-wheel-left-event
+@vindex mouse-wheel-right-event
+Similarly, some mice can generate @code{mouse-wheel-left-event} and
+@code{mouse-wheel-right-event} and can be used to scroll if
+@code{mouse-wheel-tilt-scroll} is non-@code{nil}.  However, some mice
+also generate other events at the same time as they're generating
+these scroll events which may get in the way.  The way to fix this is
+generally to unbind these events (for instance, @code{mouse-6} or
+@code{mouse-7}, but this is very hardware and operating system
+dependent).
+
 @cindex @code{pinch} event
 @item (pinch @var{position} @var{dx} @var{dy} @var{scale} @var{angle})
 This kind of event is generated by the user performing a ``pinch''