diff --git a/README.md b/README.md
index ba3c2f0..e51a05c 100644
--- a/README.md
+++ b/README.md
@@ -38,4 +38,14 @@ python -c "from http.server import HTTPServer, SimpleHTTPRequestHandler; import
 ```
 
 
+Then you run the npm script to start the server and open the browser
+
+```bash
+export TEST_URL="http://localhost:8000/zarr_store.zarr"
+npm run start
+```
+
+
+
+
 
diff --git a/src/components/App.js b/src/components/App.js
index e1ef1e4..02585d9 100644
--- a/src/components/App.js
+++ b/src/components/App.js
@@ -8,6 +8,7 @@ import "../styles/App.css";
 //const url = "http://localhost:8000/zarr_store.zarr";
 const url = "https://spikeinterface-template-database.s3.us-east-2.amazonaws.com/test_templates";
 
+const url = process.env.TEST_URL || "https://s3.amazonaws.com/my-bucket/templates";
 
 
 function App() {