diff --git a/machines/modules/host_builder.nix b/machines/modules/host_builder.nix
index 2460343..bc822fd 100644
--- a/machines/modules/host_builder.nix
+++ b/machines/modules/host_builder.nix
@@ -26,10 +26,12 @@ rec {
 
             settings = {
               substituters = [
+                "https://cache.malobeo.org"
                 "https://cache.dynamicdiscord.de"
                 "https://cache.nixos.org/"
               ];
               trusted-public-keys = [
+                # TODO: add cache.malobeo.org key after creation
                 "cache.dynamicdiscord.de:DKueZicqi2NhJJXz9MYgUbiyobMs10fTyHCgAUibRP4="
               ];
               trusted-users = [ "root" "@wheel" ];