emphasize env file changes need a restart for the server

Author: nearestnabors

app/en/home/build-tools/create-a-mcp-server/page.mdx

@@ -61,7 +61,7 @@ This generates a complete project with:
 
 - **server.py** Main server file with MCPApp and example tools
 - **pyproject.toml** Dependencies and project configuration
-- **.env.example** Example `.env` file containing a secret required by one of the generated tools in `server.py`
+- **.env.example** Example `.env` file containing a secret required by one of the generated tools in `server.py`. Environments are loaded on server start, so **if you update the `.env` file, you will need to restart your server.**
 
 `server.py` includes proper structure with command-line argument handling. It creates an `MCPApp`, defines tools with `@app.tool`, and runs with `app.run()`: