diff --git a/shell.nix b/shell.nix
index fdae90f..8a2266a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -6,6 +6,7 @@
 with pkgs;
   mkShell {
     buildInputs = [
+      alejandra # The Uncompromising Nix Code Formatter
       nix # Powerful package manager, makes packaging reliable & reproducible
       stylish-haskell # A simple Haskell code prettifier
       tea # Gitea official CLI client