=item *
If program usage has been explicitly requested by the user, it is often
-desireable to exit with a status of 1 (as opposed to 0) after issuing
-the user-requested usage message. It is also desireable to give a
+desirable to exit with a status of 1 (as opposed to 0) after issuing
+the user-requested usage message. It is also desirable to give a
more verbose description of program usage in this case.
=back