diff --git a/systemd-hardening-in-NixOS/article.md b/systemd-hardening-in-NixOS/article.md
index 943f68c..5d220de 100644
--- a/systemd-hardening-in-NixOS/article.md
+++ b/systemd-hardening-in-NixOS/article.md
@@ -272,6 +272,7 @@ As for NixOS, it also features `security.apparmor`, `security.audit` and even `p
 
 ## related resources
 
+- [add hardening to systemd services in NixOS tree](https://git.selfprivacy.org/alexoundos/articles)
 - [discourse thread about systemd services hardening](https://discourse.nixos.org/t/hardening-systemd-services/17147)
 - [systemd.resource-control man page](https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html)
 - [systemd.exec - execution environment configuration](https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html)