diff --git a/README.md b/README.md
index c27825b..a68afe1 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,16 @@
 
 My attempt to bootstrap a build environment in nix.
 
+
 ```
 nix build -f busybox.nix busybox
 ```
+
+All the busybox commands get exposed in a derivation called `utils`.
+You can build it:
+
+```
+nix build -f busybox.nix utils
+```
+
+The output of the derivation can be used as part of a `PATH` in a shell like it is done in `shellDerivation`.