diff --git a/modules/nixos/security/acme/default.nix b/modules/nixos/security/acme/default.nix
index 023a07f..e9aaacc 100644
--- a/modules/nixos/security/acme/default.nix
+++ b/modules/nixos/security/acme/default.nix
@@ -19,7 +19,7 @@ in
       default = lib.snowfall.fs.get-file "secrets/secrets.yaml";
       description = "SecretFile";
     };
-    domainname = mkOpt str "christophhollizeck.dev";
+    domainname = mkOpt str "christophhollizeck.dev" "domainname to use";
     staging = mkOpt bool virtual "Use staging server for testing or not";
   };