diff --git a/README.md b/README.md
index eb1a89a..de9b1e0 100644
--- a/README.md
+++ b/README.md
@@ -10,4 +10,8 @@ run with:
 sudo ./garage-latency-simple.R
 ```
 
+you can set a different topology:
 
+```
+MKNET_DC=./mknet/with-vdsl.yml sudo ./garage-latency-simple.R
+```