diff --git a/shell.nix b/shell.nix
index 3bd2217..c9f813e 100644
--- a/shell.nix
+++ b/shell.nix
@@ -12,5 +12,6 @@ pkgs.mkShell {
     pkgs.vim
     pkgs.sqlite
     pkgs.tmux
+    pkgs.tree
   ];
 }