diff --git a/packages/integrations/vercel/README.md b/packages/integrations/vercel/README.md
index f7726805b..9507a4fa3 100644
--- a/packages/integrations/vercel/README.md
+++ b/packages/integrations/vercel/README.md
@@ -12,7 +12,15 @@ This adapter allows Astro to deploy your SSR site to [Vercel](https://www.vercel
 
 ## Why Astro Vercel
 
-If you're using Astro as a static site builder—its behavior out of the box—you don't need an adapter.
+If you're using Astro as a static site builder — its behavior out of the box — you don't need an adapter. In order to return the correct status code for non existing pages, you must add the following config file at the root of your project:
+
+ __`vercel.json`__
+```json
+{
+  "cleanUrls": true,
+  "trailingSlash": false
+}
+```
 
 If you wish to [use server-side rendering (SSR)](https://docs.astro.build/en/guides/server-side-rendering/), Astro requires an adapter that matches your deployment runtime.