Add introductory text about how to change the IP

docs/maintenance.md

@@ -110,6 +110,9 @@ if you need assistance.
 
 ## Change the IP of your cluster
 
+In case your cluster needs to migrate to another IP use these steps to make
+OpenAppStack and `rke` adopt it:
+
 * `rke etcd snapshot-save --config /var/lib/OpenAppStack/rke/cluster.yml --name test`
 * Change IP in `/var/lib/OpenAppStack/rke/cluster.yml`
 * `/usr/local/bin/rke up --config=/var/lib/OpenAppStack/rke/cluster.yml`