diff --git a/hosts/knot/default.nix b/hosts/knot/default.nix
index 0e07e9fa..196a33f5 100644
--- a/hosts/knot/default.nix
+++ b/hosts/knot/default.nix
@@ -145,6 +145,7 @@
           domain = "c3d2.";
           acl = "zone_xfr";
           catalog-role = "generate";
+          notify = [ "ns1.supersandro.de" ];
           storage = "/var/lib/knot/catalog";
         }
       ] ++ map ({ acl ? [], ... }@zone: {