Add STATIC/PASSIVE mode config information.

sbin/arpsponge.pl

@@ -2072,6 +2072,10 @@ =head2 Init Variables
 
 The argument to C<--pending>.
 
+=item I<PASSIVE_MODE> (boolean)
+
+Whether or not to turn on the L<--passive|/--passive> flag.
+
 =item I<PERMISSIONS>
 
 The argument to C<--permissions>.
@@ -2095,6 +2099,10 @@ =head2 Init Variables
 Together with the interface (I<$INTERFACE>) this is used to specify the
 I<rundir> to the sponge ("B<--rundir>=I<$SPONGE_VAR>/I<$INTERFACE>").
 
+=item I<STATIC_MODE> (boolean)
+
+Whether or not to turn on the L<--static|/--static> flag.
+
 =item I<SWEEP>
 
 The argument to C<--sweep>.
@@ -2123,6 +2131,14 @@ =head2 Init Variables
 as the device name, but this can be overridden with the I<DEVICE>
 variable.
 
+=item I<STATIC_STATE_FILE> (string)
+
+If I<STATIC_MODE> is true, this variable can be used to specify
+a file with a status dump to load on (re)start of the ARP sponge.
+
+See L<asctl's "load status" command|"asctl/load status"> for more
+information.
+
 =back
 
 =head1 FILES