diff --git a/systemd-hardening-in-NixOS/article.md b/systemd-hardening-in-NixOS/article.md
index beea303..5f712fe 100644
--- a/systemd-hardening-in-NixOS/article.md
+++ b/systemd-hardening-in-NixOS/article.md
@@ -271,3 +271,4 @@ As for NixOS, it also features `security.apparmor`, `security.audit` and even `p
 - [limit the impact of a security intrusion with systemd directives article](https://www.ctrl.blog/entry/systemd-opensmtpd-hardening.html)
 - [hardening applications with systemd](https://blog.sergeantbiggs.net/posts/hardening-applications-with-systemd/)
 - [systemd hardening options explained](https://docs.arbitrary.ch/security/systemd.html)
+- ["Paranoid NixOS Setup" article](https://xeiaso.net/blog/paranoid-nixos-2021-07-18)