Add missing introductory exportPathMap purpose description (#17444)

The page describing exportPathMap goes straight into an example without explaining what the config is for.
vercel · Oct 3, 2020 · f8aeaa4 · f8aeaa4
1 parent f27e1f8
commit f8aeaa4
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diff --git a/docs/api-reference/next.config.js/exportPathMap.md b/docs/api-reference/next.config.js/exportPathMap.md
@@ -13,6 +13,8 @@ description: Customize the pages that will be exported as HTML files when using
   </ul>
 </details>
 
+`exportPathMap` allows you to specify a mapping of request paths to page destinations, to be used during export.
+
 Let's start with an example, to create a custom `exportPathMap` for an app with the following pages:
 
 - `pages/index.js`