Update README.md

Author: EricSimons

README.md

@@ -21,7 +21,12 @@ To get the frontend running locally:
 - `npm install` to install all req'd dependencies
 - `npm start` to start the local server (this project uses create-react-app)
 
-For convenience, we have a live API server running at https://conduit.productionready.io/api for the application to make requests against. You can view [the API spec here](https://github.com/GoThinkster/productionready/blob/master/API.md) which contains all routes & responses for the server. We'll release the backend code in a few weeks should anyone be interested in it.
+### Integrating with a backend
+
+For convenience, we have a live API server running at https://conduit.productionready.io/api for the application to make requests against. You can view [the API spec here](https://github.com/GoThinkster/productionready/blob/master/api) which contains all routes & responses for the server.
+
+If you want to change the API URL to a local server, simply edit `src/agent.js` and change `API_ROOT` to the local server's URL (i.e. `localhost:3000/api`)
+
 
 ## Functionality overview