diff --git a/docs/advanced-features/amp-support/introduction.md b/docs/advanced-features/amp-support/introduction.md
index a9ad07dea40bf8f..89ca03b4b3c00a9 100644
--- a/docs/advanced-features/amp-support/introduction.md
+++ b/docs/advanced-features/amp-support/introduction.md
@@ -19,6 +19,10 @@ You can read more about AMP in the official [amp.dev](https://amp.dev/) site.
 
 To enable AMP support for a page, and to learn more about the different AMP configs, read the [API documentation for `next/amp`](/docs/api-reference/next/amp.md).
 
+## Caveats
+
+- Only CSS-in-JS is supported. [CSS Modules](/docs/basic-features/built-in-css-support.md) aren't supported by AMP pages at the moment. You can [contribute CSS Modules support to Next.js](https://github.com/zeit/next.js/issues/10549).
+
 ## Related
 
 For more information on what to do next, we recommend the following sections: