@item :help-echo
Specifies how to display a message whenever you move to the widget with
either @code{widget-forward} or @code{widget-backward} or move the mouse
-over it (using the standard @code{help-echo} mechanism}). The argument
+over it (using the standard @code{help-echo} mechanism). The argument
is either a string to display or a function of one argument, the widget,
which should return a string to display.