+my $format;
+
+=item B<--format> raw
+
+Specify the format of disk images given on the command line. If this
+is omitted then the format is autodetected from the content of the
+disk image.
+
+If disk images are requested from libvirt, then this program asks
+libvirt for this information. In this case, the value of the format
+parameter is ignored.
+
+If working with untrusted raw-format guest disk images, you should
+ensure the format is always specified.
+
+=cut
+
+my $memsize;
+
+=item B<--memsize MB> | B<-m MB>
+
+Change the amount of memory allocated to the rescue system. The
+default is set by libguestfs and is small but adequate for running
+system tools. The occasional program might need more memory. The
+parameter is specified in megabytes.
+
+=cut
+
+my $network;
+
+=item B<--network>
+
+Enable QEMU user networking in the guest.
+
+=cut
+