diff --git a/src/pages/docs/content-configuration.mdx b/src/pages/docs/content-configuration.mdx
index bcddf0dc6..8c842ce07 100644
--- a/src/pages/docs/content-configuration.mdx
+++ b/src/pages/docs/content-configuration.mdx
@@ -647,3 +647,5 @@ You can use packages like `npm-run-all` or `concurrently` to compile your CSS al
 ```
 
 Either way, please be sure to [check for an existing issue](https://github.com/tailwindlabs/tailwindcss/issues) or [open a new one](https://github.com/tailwindlabs/tailwindcss/issues/new/choose) so we can figure out the problem and try to improve compatibility with whatever tool you are using.
+
+Finally, double check that you are using Tailwind v3 as Tailwind v4 ignores `tailwind.config.js` altogether, and follow the [relevant documentation for Tailwind v4](https://tailwindcss.com/docs/detecting-classes-in-source-files) if applicable.