* doc/lispref/markers.texi (The Mark): Mention that the mouse will
enable the `(only)' transient mark mode (bug#14945).
then @code{transient-mark-mode} is set to the value @var{oldval} after
any subsequent command that moves point and is not shift-translated
(@pxref{Key Sequence Input, shift-translation}), or after any other
-action that would normally deactivate the mark.
+action that would normally deactivate the mark. (Marking a region
+with the mouse will temporarily enable @code{transient-mark-mode} in
+this way.)
@end defopt
@defopt mark-even-if-inactive