diff --git a/README.asciidoc b/README.asciidoc
index 725f3c3..459b0b8 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -51,7 +51,7 @@ Add this module to your NixOS configuration:
 
 ```nix
 { ... }: {
-  environment.systemPackages = [ (import (builtins.fetchTarball https://github.com/hercules-ci/arion/tarball/master) {}) ];
+  environment.systemPackages = [ (import (builtins.fetchTarball https://github.com/hercules-ci/arion/tarball/master) {}).arion ];
   virtualisation.docker.enable = true;
   users.extraUsers.myuser.extraGroups = ["docker"];
 }