diff --git a/webrtc/signalling/README.md b/webrtc/signalling/README.md
index 7b0573835d..e17e9380d5 100644
--- a/webrtc/signalling/README.md
+++ b/webrtc/signalling/README.md
@@ -13,7 +13,7 @@ In three separate tabs, run consecutively:
 
 ```console
 $ ./generate_cert.sh
-$ ./simple-server.py
+$ ./simple_server.py
 ```
 
 ### Session Based