diff --git a/flake.nix b/flake.nix
index 4f0cd61..c207487 100644
--- a/flake.nix
+++ b/flake.nix
@@ -50,6 +50,7 @@
             "aarch64-linux"
             "aarch64-darwin"
           ],
+          checks ? pkgs: { },
           devShellPackages ? (pkgs: [ ]),
           treeFmtFile ? ./treefmt.nix,
           ...
@@ -72,7 +73,7 @@
             formatter = treeFmtEval.config.build.wrapper;
             checks = {
               fmt = treeFmtEval.config.build.check self;
-            };
+            } // (checks pkgs);
             devShells.default = pkgs.mkShell {
               packages = [
                 pkgs.nixfmt-rfc-style