diff --git a/plugins/inventory/nova.ini b/plugins/inventory/nova.ini
index 040c52bcee9..4900c496516 100644
--- a/plugins/inventory/nova.ini
+++ b/plugins/inventory/nova.ini
@@ -1,37 +1,45 @@
 # Ansible OpenStack external inventory script
 
 [openstack]
+
+#-------------------------------------------------------------------------
+#  Required settings
+#-------------------------------------------------------------------------
+
 # API version
 version       = 2
 
 # OpenStack nova username
 username      =
 
-# OpenStack nova api_key
+# OpenStack nova api_key or password
 api_key       =
 
 # OpenStack nova auth_url
 auth_url      =
 
-# Authentication system
-auth_system = keystone
+# OpenStack nova project_id or tenant name
+project_id    =
 
-# OpenStack nova project_id
-project_id    = 
+#-------------------------------------------------------------------------
+#  Optional settings
+#-------------------------------------------------------------------------
+
+# Authentication system
+# auth_system = keystone
 
 # Serverarm region name to use
-region_name   =
+# region_name   =
 
 # Specify a preference for public or private IPs (public is default)
-prefer_private = False
+# prefer_private = False
 
 # What service type (required for newer nova client)
-service_type = compute
+# service_type = compute
 
 
 # TODO: Some other options
 # insecure      =
 # endpoint_type =
 # extensions    =
-# service_type  =
 # service_name  =