diff --git a/README.md b/README.md
index 6a09a29a..9cd851ae 100644
--- a/README.md
+++ b/README.md
@@ -100,6 +100,9 @@ NetGuard will try to workaround this and remove the error message when it succee
 Some LineageOS versions have a broken Android VPN implementation, causing all traffic to be blocked,
 please see [this FAQ](https://github.com/M66B/NetGuard/blob/master/FAQ.md#user-content-faq51) for more information.
 
+On GrapheneOS, the Android *Always-On VPN* function and the sub option '*Block connections without VPN*' are enabled by default.
+However, this sub option will result in blocking all traffic, please see [this FAQ](https://github.com/M66B/NetGuard/blob/master/FAQ.md#user-content-faq51).
+
 NetGuard is not supported on GrapheneOS and CopperheadOS because there are too often breaking changes in these custom Android versions.
 
 NetGuard is not supported for apps installed in a [work profile](https://developer.android.com/work/managed-profiles),