diff --git a/docs/advanced-features/preview-mode.md b/docs/advanced-features/preview-mode.md
index a6700718692d..e9cd56f40f61 100644
--- a/docs/advanced-features/preview-mode.md
+++ b/docs/advanced-features/preview-mode.md
@@ -173,6 +173,8 @@ https://<your-site>/api/preview?secret=<token>&slug=<path>
 
 ## More Details
 
+> **Note**: during rendering `next/router` exposes an `isPreview` flag, see the [router object docs](/docs/api-reference/next/router.md#router-object) for more info.
+
 ### Clear the Preview Mode cookies
 
 By default, no expiration date is set for Preview Mode cookies, so the preview session ends when the browser is closed.