-virt-rescue gives you a rescue shell and some simple recovery tools
-which you can use on a virtual machine disk image.
+virt-rescue is like a Rescue CD, but for virtual machines, and without
+the need for a CD. virt-rescue gives you a rescue shell and some
+simple recovery tools which you can use to examine or rescue a virtual
+machine or disk image.
+
+You can run virt-rescue on any virtual machine known to libvirt, or
+directly on disk image(s):
+
+ virt-rescue GuestName
+
+ virt-rescue --ro /path/to/disk.img
+
+ virt-rescue /dev/sdc
+
+For live VMs you I<must> use the --ro option.