diff --git a/flakeModules/flake-module.nix b/flakeModules/flake-module.nix
index bd840e510..17514d000 100644
--- a/flakeModules/flake-module.nix
+++ b/flakeModules/flake-module.nix
@@ -1,7 +1,23 @@
-{ self, config, ... }:
+{
+  self,
+  inputs,
+  config,
+  lib,
+  flake-parts-lib,
+  ...
+}:
 {
   flake.flakeModules = {
     clan = import ./clan.nix self;
     default = config.flake.flakeModules.clan;
+    # testModule is an unstable interface and can change at any time.
+    testModule = lib.modules.importApply ../lib/flake-parts/clan-nixos-test.nix {
+      inherit
+        self
+        inputs
+        lib
+        flake-parts-lib
+        ;
+    };
   };
 }
diff --git a/lib/flake-parts/clan-nixos-test.nix b/lib/flake-parts/clan-nixos-test.nix
index 7b0771a8f..40e631929 100644
--- a/lib/flake-parts/clan-nixos-test.nix
+++ b/lib/flake-parts/clan-nixos-test.nix
@@ -24,7 +24,7 @@ in
       in
       {
         options.clan.nixosTests = mkOption {
-          description = "Clan NixOS tests configuration";
+          description = "Unstable interface! Clan NixOS tests configuration";
           type = types.attrsOf types.unspecified;
           default = { };
         };