Update debugging-replace-renderer-api.md

gatsbyjs · Jan 9, 2019 · 3811159 · 3811159
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 title: Debugging replaceRenderer API
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+## Prerequisites
+
+If you’re not familiar with Gatsby’s lifecycle, see the overview [Gatsby Lifecycle APIs](/gatsby-lifecycle-apis/).
+
 ## What is the `replaceRenderer` API?
 
 The `replaceRenderer` API is one of [Gatsby's Server Side Rendering (SSR) extension APIs](/docs/ssr-apis/#replaceRenderer). This API is called when you run `gatsby build` and is used to customise how Gatsby renders your static content. It can be implemented by any Gatsby plugin or your `gatsby-ssr.js` file - adding support for Redux, CSS-in-JS libraries or any code that needs to change Gatsby's default HTML output.