diff --git a/README.md b/README.md
index 0a75774d..816f0205 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ It will create a fat binary in `target/release/oxigraph_server`.
 
 ### Usage
 
-Run `oxigraph_server` to start the server. It listens by default on `localhost:7878`.
+Run `oxigraph_server -f my_data_storage_directory` to start the server where `my_data_storage_directory` is the directory where you want Oxigraph data to be stored in. It listens by default on `localhost:7878`.
 
 The server provides an HTML UI with a form to execute SPARQL requests.