diff --git a/README.rst b/README.rst
index 26cd653..1e1b003 100644
--- a/README.rst
+++ b/README.rst
@@ -110,7 +110,7 @@
           enabled: true
       machines:
         machine1:
-          interfaces:
+          interface:
             mac: "11:22:33:44:55:66"
           power_parameters:
             power_type: ipmi
@@ -119,6 +119,8 @@
             power_password: bmc_password
             #Optional (for legacy HW)
             power_driver: LAN
+            # Used in case of power_type: virsh
+            power_id: my_libvirt_vm_name
           distro_series: xenial
           hwe_kernel: hwe-16.04
       devices:
diff --git a/_modules/maas.py b/_modules/maas.py
index 6624f94..5907068 100644
--- a/_modules/maas.py
+++ b/_modules/maas.py
@@ -371,6 +371,8 @@
         if 'power_password' in power_data:
             data['power_parameters_power_pass'] = \
                 power_data['power_password']
+        if 'power_id' in power_data:
+            data['power_parameters_power_id'] = power_data['power_id']
         return data
 
     def update(self, new, old):