Update README.md

Author: quisido

README.md

@@ -1,8 +1,11 @@
 # useFetch [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=You%20can%20now%20use%20React%20Suspense%20with%20the%20Fetch%20API!&url=https://github.com/CharlesStover/fetch-suspense&via=CharlesStover&hashtags=react,reactjs,javascript,typescript,webdev,webdevelopment) [![version](https://img.shields.io/npm/v/fetch-suspense.svg)](https://www.npmjs.com/package/fetch-suspense) [![minified size](https://img.shields.io/bundlephobia/min/fetch-suspense.svg)](https://www.npmjs.com/package/fetch-suspense) [![minzipped size](https://img.shields.io/bundlephobia/minzip/fetch-suspense.svg)](https://www.npmjs.com/package/fetch-suspense) [![downloads](https://img.shields.io/npm/dt/fetch-suspense.svg)](https://www.npmjs.com/package/fetch-suspense) [![build](https://api.travis-ci.com/CharlesStover/fetch-suspense.svg)](https://travis-ci.com/CharlesStover/fetch-suspense/)
 
-`useFetch` is a React hook that supports the React 16.6 Suspense component implementation.
+`useFetch` is a React hook that supports the React 16.6 Suspense component
+implementation.
 
-The design decisions and development process for this package are outlind in the Medium article [React Suspense with the Fetch API](https://medium.com/@Charles_Stover/react-suspense-with-the-fetch-api-a1b7369b0469).
+The design decisions and development process for this package are outlind in
+the Medium article
+[React Suspense with the Fetch API](https://medium.com/@Charles_Stover/react-suspense-with-the-fetch-api-a1b7369b0469).
 
 ## Install
 
@@ -13,18 +16,54 @@ The design decisions and development process for this package are outlind in the
 
 ```JavaScript
 import useFetch from 'fetch-suspense';
+import React, { Suspense } from 'react';
 
-// This fetching component will be delayed by
-//   Suspense until the fetch request resolves.
+// This fetching component will be delayed by Suspense until the fetch request
+//   resolves.
 // The return value of useFetch will be the response of the server.
 const MyFetchingComponent = () => {
   const data = useFetch('/path/to/api', { method: 'POST' });
   return 'The server responded with: ' + data;
 };
 
 // The App component wraps the asynchronous fetching component in Suspense.
-// The fallback component (loading text) is
-//   displayed until the fetch request resolves.
+// The fallback component (loading text) is displayed until the fetch request
+//   resolves.
+const App = () => {
+  return (
+    <Suspense fallback="Loading...">
+      <MyFetchingComponent />
+    </Suspense>
+  );
+};
+```
+
+## Using a Custom Fetch API
+
+If you don't want to rely on the global `fetch` API, you can create your own
+`useFetch` hook by importing the `createUseFetch` helper function.
+
+```JavaScript
+import { createUseFetch } from 'fetch-suspense';
+import myFetchApi from 'my-fetch-package';
+import React, { Suspense } from 'react';
+
+// Create a useFetch hook using one's own Fetch API.
+// NOTE: useFetch hereafter refers to this constant, not the default export of
+//   the fetch-suspense package.
+const useFetch = createUseFetch(myFetchApi);
+
+// This fetching component will be delayed by Suspense until the fetch request
+//   resolves.
+// The return value of useFetch will be the response of the server.
+const MyFetchingComponent = () => {
+  const data = useFetch('/path/to/api', { method: 'POST' });
+  return 'The server responded with: ' + data;
+};
+
+// The App component wraps the asynchronous fetching component in Suspense.
+// The fallback component (loading text) is displayed until the fetch request
+//   resolves.
 const App = () => {
   return (
     <Suspense fallback="Loading...">