diff --git a/README.md b/README.md
index 8749695..1379c29 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ The example configuration file includes profiles suitable for receiving data fro
 
 Once configured, you can start-up the horusmapper server with:
 ```
-$ python horusmapper.py
+$ python3 horusmapper.py
 ```
 
 The server can be stopped with CTRL+C. Sometimes the server doesn't stop cleanly and may the process may need to be killed. (Sorry!)