diff --git a/docs/docs/user/known-instances.md b/docs/docs/user/known-instances.md
index 8307856..67fb0cf 100644
--- a/docs/docs/user/known-instances.md
+++ b/docs/docs/user/known-instances.md
@@ -28,6 +28,7 @@ This page contains a non-exhaustive list with all websites using Anubis.
 - http://code.hackerspace.pl/
 - https://wiki.archlinux.org/
 - https://git.devuan.org/
+- https://hydra.nixos.org/
 
 - <details>
   <summary>The United Nations</summary>