diff --git a/.sd/nix/sync b/.sd/nix/sync
new file mode 100755
index 0000000..ada4cd5
--- /dev/null
+++ b/.sd/nix/sync
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+# make user environment match ~/.dotfiles/user.nix
+# 
+# This will remove any packages you've installed with nix-env
+# but have not added to user.nix. To see exactly what this
+# will do, run:
+# 
+#     sd nix diff
+# https://github.com/ianthehenry/sd-nix/blob/master/sync
+
+set -euo pipefail
+
+nix-env -irf ~/.dotfiles/user.nix
diff --git a/user.nix b/user.nix
new file mode 100644
index 0000000..7a53c49
--- /dev/null
+++ b/user.nix
@@ -0,0 +1,6 @@
+with import <nixpkgs> {}; [
+  ghq
+  onefetch
+  nodejs
+  nix
+]
diff --git a/zsh/.zshrc b/zsh/.zshrc
index 5d0c7d4..ffb67d9 100644
--- a/zsh/.zshrc
+++ b/zsh/.zshrc
@@ -138,6 +138,9 @@ miniplug theme 'tjquillan/pastel'
 
 miniplug load
 
+export SD_ROOT="$HOME/.dotfiles/.sd"
+export SD_CAT=bat
+
 # auto cd must be set later
 setopt AUTO_CD