-@kbd{Mouse-2}, and delete all the windows in a frame except one window
-by clicking on that window's mode line with @kbd{Mouse-3}.
-
- The easiest way to adjust window heights is with a mouse. If you
-press @kbd{Mouse-1} on a mode line, you can drag that mode line up or
-down, changing the heights of the windows above and below it.
+@kbd{Mouse-3}, and delete all the windows in a frame except one window
+by clicking on that window's mode line with @kbd{Mouse-2}.
+
+ You can also adjust window heights and widths with the mouse. If
+you press @kbd{Mouse-1} on a mode line, you can drag that mode line up
+or down, changing the heights of the windows above and below it. If
+you press it on the divider between two consecutive mode lines, you
+can drag that divider right or left, changing the widths of the
+windows to either side. Note that changing heights and widths with
+the mouse never deletes windows, it just refuses to make any window
+smaller than it can be.