diff --git a/nix/options.nix b/nix/options.nix
index 80cc7b28..bb51983c 100644
--- a/nix/options.nix
+++ b/nix/options.nix
@@ -10,6 +10,8 @@
     mkPackageOption
     types
     ;
+
+ settingsFormat = pkgs.formats.yaml { };
 in {
   options.services.headplane = {
     enable = mkEnableOption "headplane";
@@ -27,6 +29,8 @@ in {
         See: https://github.com/tale/headplane/blob/main/config.example.yaml
       '';
       type = types.submodule {
+        freeformType = settingsFormat.type;
+
         options = {
           server = mkOption {
             type = types.submodule {