diff --git a/README.md b/README.md
index 2d2ecba..5cf86cc 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ run it from whatever location it happens to occupy in `nixpkgs` without really t
   either install it in your nix environment
 
   ```bash
-    nix-env --install comma
+    nix-env -f '<nixpkgs>' -iA comma
   ```
 
   or add this snippet to your NixOS configuration.