# !/usr/bin/python
-# usage: sudo mn --controller=remote,ip=<controller_ip> --switch=ovsk,protocols=OpenFlow13 --custom <path to customtopo.py> --topo ring ...
+# usage: sudo mn --controller=remote,ip=<controller_ip> --switch=ovsk,protocols=OpenFlow13
+# --custom <path to customtopo.py> --topo ring ...
from mininet.topo import Topo