diff --git a/README.md b/README.md
index fce6f0e..a7e38fc 100644
--- a/README.md
+++ b/README.md
@@ -687,6 +687,7 @@ used by this network are configurable at the provider level.
   for for more information.
 * `management_network_autostart` - Automatic startup of mgmt network, if not
   specified the default is 'false'.
+* `management_network_mac` - MAC address of management network interface.
 
 You may wonder how vagrant-libvirt knows the IP address a VM received.  Libvirt
 doesn't provide a standard way to find out the IP address of a running domain.