Update "how gatsby works" documentation (#243) (#5181)

* Add a note about CNAME file in `static`
gatsbyjs · Apr 30, 2018 · 515420d · 515420d
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diff --git a/docs/docs/how-gatsby-works-with-github-pages.md b/docs/docs/how-gatsby-works-with-github-pages.md
@@ -47,4 +47,4 @@ After running `npm run deploy` you should see your website at `http://username.g
 
 ## Custom domains
 
-If you use a [custom domain](https://help.github.com/articles/using-a-custom-domain-with-github-pages/), don't add a `pathPrefix` as it will break navigation on your site. Path prefixing is only necessary when the site is _not_ at the root of the domain like with repository sites.
+If you use a [custom domain](https://help.github.com/articles/using-a-custom-domain-with-github-pages/), don't add a `pathPrefix` as it will break navigation on your site. Path prefixing is only necessary when the site is _not_ at the root of the domain like with repository sites. Also don't forget to add your [CNAME](https://help.github.com/articles/troubleshooting-custom-domains/#github-repository-setup-errors) file to the `static` directory.