diff --git a/shell.nix b/shell.nix
index c8df6ec..7047a58 100644
--- a/shell.nix
+++ b/shell.nix
@@ -10,4 +10,13 @@
       nh
     ];
   };
+  # Formatters needed for 'just fmt'
+  format = pkgs.mkShell {
+    packages = with pkgs; [
+      nodePackages.prettier
+      nixfmt-rfc-style
+      treefmt
+      shfmt
+    ];
+  };
 }