diff --git a/variables.nix b/variables.nix
new file mode 100644
index 0000000..3727a99
--- /dev/null
+++ b/variables.nix
@@ -0,0 +1,17 @@
+{
+  lib,
+  config,
+  ...
+}: let
+  inherit (lib) mkOption types;
+  inherit (config.liv) variables;
+in {
+  options.liv.variables = {
+    primaryDomain = mkOption {
+      default = "liv.town";
+      type = types.str;
+      readOnly = true;
+      description = "My primary domain";
+    };
+  };
+}