The preferred way to create standard buttons is to use default value of
\arg{label}. If no label is supplied and \arg{id} is one of standard IDs from
-\helpref{this list}{stockitems}, standard label will be used. In additon to
+\helpref{this list}{stockitems}, standard label will be used. In addition to
that, the button will be decorated with stock icons under GTK+ 2.
\wxheading{Parameters}