diff --git a/flake.lock b/flake.lock
index c3acea3..523ee1e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -54,11 +54,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1648231648,
-        "narHash": "sha256-1X5rhcb53AFiMPiln5l/694L+J1PRudFKkemQtJSOL4=",
+        "lastModified": 1648232278,
+        "narHash": "sha256-GDyLjj64sA65MPMlOtzs5DHPK4O5O8u6jMYKiGHgaPU=",
         "ref": "lc/fourmolu",
-        "rev": "d4418e62a1b4ca84915ca35af22beb303569e649",
-        "revCount": 15,
+        "rev": "822770e9ca42d594a25f5b161f93f21c5d023bbd",
+        "revCount": 19,
         "type": "git",
         "url": "https://gitlab.homotopic.tech/nix/lint-utils.git"
       },
diff --git a/flake.nix b/flake.nix
index 1dc2c5f..412507a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -55,13 +55,29 @@
         {
           # Used by `nix build` & `nix run` (prod exe)
           defaultPackage = project false;
+          # Used by `nix develop` (dev shell)
+          devShell = project true;
 
+          # Used by `nix run ...`
           apps = {
             format = inputs.lint-utils.apps.${system}.fourmoluStandard8107;
           };
 
-          # Used by `nix develop` (dev shell)
-          devShell = project true;
+          # Used by `nix flake check`
+          checks = {
+            format-haskell = inputs.lint-utils.linters.${system}.fourmoluStandardGHC8107;
+            format-cabal = inputs.lint-utils.linters.${system}.cabal;
+            format-nix = inputs.lint-utils.linters.${system}.nixpkgs-fmt;
+          };
+          check = 
+            pkgs.runCommand "combined-checks"
+              {
+                checksss = builtins.attrValues self.checks.${system};
+              } ''
+              echo $checksss
+              touch $out
+            '' ;
+
         }) // {
       # For hercules-CI support, 
       # https://docs.hercules-ci.com/hercules-ci/guides/upgrade-to-agent-0.9/#_upgrade_your_repositories