diff --git a/trellis/README.md b/trellis/README.md
index 3600075..6dd70c4 100644
--- a/trellis/README.md
+++ b/trellis/README.md
@@ -74,7 +74,7 @@
 ## Start Mininet Emulation
 ```
 cd routing/trellis
-sudo ./trellis.py --controllers ONOS_CONTROLLER_IP1, ONOS_CONTROLLER_IP2,...,ONOS_CONTROLLER_IPN
+sudo ./trellis.py --controllers ONOS_CONTROLLER_IP1,ONOS_CONTROLLER_IP2,...,ONOS_CONTROLLER_IPN
 ```
 
 ## Verify Network Connectivity
@@ -106,7 +106,7 @@
 Now start mininet to test
 ```
 cd routing/trellis
-sudo ./trellis.py --controllers ONOS_CONTROLLER_IP1, ONOS_CONTROLLER_IP2,...,ONOS_CONTROLLER_IPN
+sudo ./trellis.py --controllers ONOS_CONTROLLER_IP1,ONOS_CONTROLLER_IP2,...,ONOS_CONTROLLER_IPN
 ```
 
 # Troubleshooting