diff --git a/apps/reference/docs/guides/auth/auth-ui/auth-ui-customization.mdx b/apps/reference/docs/guides/auth/auth-ui/auth-ui-customization.mdx
index 9cce9bb607d..ec3831a87e2 100644
--- a/apps/reference/docs/guides/auth/auth-ui/auth-ui-customization.mdx
+++ b/apps/reference/docs/guides/auth/auth-ui/auth-ui-customization.mdx
@@ -161,7 +161,7 @@ const App = () => (
 
 You can swich between different variations of your theme [by using the "theme" prop](#switching-theme-variations).
 
-## Using your own CSS classes
+## Custom CSS classes {#custom-css-classes}
 
 You can use custom CSS classes with Auth UI.