=head1 RETURN VALUE
As usual for Nagios plugins, this program writes a short, one line status
-message to STDOUT and signals success or failure with it's return value. It
+message to STDOUT and signals success or failure with its return value. It
exits with a return value of B<0> for I<success>, B<1> for I<warning> and B<2>
for I<critical>. If the values are not available or some other error occurred,
it returns B<3> for I<unknown>.