diff --git a/roles/nixpkgs-dev.nix b/roles/nixpkgs-dev.nix
index 9815cd9..ee6bb04 100644
--- a/roles/nixpkgs-dev.nix
+++ b/roles/nixpkgs-dev.nix
@@ -17,6 +17,7 @@
       nix-prefetch-github      # Prefetch sources from github
       nix-prefetch-git         # Prefetch sources from git
       nix-review               # Review pull-requests on https://github.com/NixOS/nixpkgs
+      nix-top                  # Tracks what nix is building
       nix-universal-prefetch   # Uses nixpkgs fetchers to figure out hashes
       nodePackages.node2nix    # Generate Nix expressions to build NPM packages
       nox                      # Tools to make Nix nicer