Update styled-component docs (#841)

* Add details to custom Document documentation Custom document must be created at ./Pages/_document.js, which is not noted in the README… so I updated it. * Add note to styled-components example about existing issue * Made phrasing a bit more clear * Another phrasing update. * from P to p
vercel · Jan 21, 2017 · e67d62d · e67d62d
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diff --git a/README.md b/README.md
@@ -410,9 +410,10 @@ Supported options:
   <ul><li><a href="./examples/with-styled-components">Styled components custom document</a></li></ul>
 </details></p>
 
-Pages in `Next.js` skip the definition of the surrounding document's markup. For example, you never include `<html>`, `<body>`, etc. But we still make it possible to override that:
+Pages in `Next.js` skip the definition of the surrounding document's markup. For example, you never include `<html>`, `<body>`, etc. To override that default behavior, you must create a file at `./pages/_document.js`, where you can extend the `Document` class:
 
 ```jsx
+// ./pages/_document.js
 import Document, { Head, Main, NextScript } from 'next/document'
 
 export default class MyDocument extends Document {

diff --git a/examples/with-styled-components/README.md b/examples/with-styled-components/README.md
@@ -28,3 +28,7 @@ now
 This example features how you use a different styling solution than [styled-jsx](https://github.com/zeit/styled-jsx) that also supports universal styles. That means we can serve the required styles for the first render within the HTML and then load the rest in the client. In this case we are using [styled-components](https://github.com/styled-components/styled-components).
 
 For this purpose we are extending the `<Document />` and injecting the server side rendered styles into the `<head>`.
+
+## Notes:
+
+- On initial install, you may see a server-side error: `TypeError: Cannot read property 'cssRules' of undefined when using this line of code` until you actually render a `styled-component`. I have submitted a PR to fix this issue with them [here](https://github.com/styled-components/styled-components/pull/391). For the time being, make sure you render at least one `styled-component` when you use this.