Update docs/quickstarts/fastify.mdx

Co-authored-by: Alexis Aguilar <[email protected]>
clerk · Sep 26, 2024 · ef80119 · ef80119
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@@ -37,6 +37,8 @@ Learn how to integrate Clerk into your Fastify backend for secure user authentic
 
 > [!IMPORTANT]
 > [Fastify is only compatible with Next.js versions 13.4 and below](https://github.com/fastify/fastify-nextjs). If you're using a newer version of Next.js, consider using a different backend framework that supports the latest Next.js features.
+>
+> This guide uses ECMAScript Modules (ESM). To use ESM in your project, you must include `"type": "module"` in your `package.json`.
 
 > [!NOTE]
 > If you're using ECMAScript Modules (ESM) in your project, you must include `"type": "module"` in your `package.json` to enable ESM support in Node.js.