diff --git a/tools.nix b/tools.nix
index f95a48b..a45208a 100644
--- a/tools.nix
+++ b/tools.nix
@@ -22,6 +22,7 @@
       tree
       (import ./vim.nix)
       wget
+      which
     ];
     shellAliases = {
       byobu = "byobu-tmux";