diff --git a/flake.nix b/flake.nix
index 815061f..431a59b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,7 +18,10 @@
       in
       {
         devShells.default = pkgs.mkShell {
-          packages = with pkgs; [ smlnj ];
+          packages = with pkgs; [
+            smlnj
+            millet
+          ];
         };
       }
     );