diff --git a/hosts b/hosts
index 25738d8..55c283f 100644
--- a/hosts
+++ b/hosts
@@ -1,5 +1,9 @@
+# A demo cluster of three nodes.
+
 [databases]
+openstack01-node01
 openstack01-node02
+openstack01-node03
 
 [keystone]
 openstack01-node03
@@ -15,24 +19,9 @@ openstack01-node01
 openstack01-node02
 openstack01-node03
 
-#[cassandra]
-#openstack01-node[01:03]
-
-#openstack01-node01
-#
-#[next_cassandra]
-#openstack01-node02
-#openstack01-node03
-
 [memcached]
 openstack01-node03
 
-#[first_cassandra:vars]
-#run_options=""
-#
-#[next_cassandra:vars]
-#run_options="-e CASSANDRA_SEEDS=172.23.41.1"
-
 [neutron-controller]
 openstack01-node01 physical_interface_mappings=provider:ens192
 
@@ -46,4 +35,4 @@ openstack01-node03
 openstack01-node01 storage_volume=/dev/loop0
 
 [nova-compute]
-openstack01-node04 physical_interface_mappings=provider:dummy0
+openstack01-node04 physical_interface_mappings=provider:enp4s0f0
diff --git a/os-test b/os-test
index 5023213..52a6c0d 100644
--- a/os-test
+++ b/os-test
@@ -1,3 +1,5 @@
+# An all in one
+
 [databases]
 os-test