diff --git a/README.md b/README.md
index fe8aa80..b5f84ef 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@
    + `hardware-configuration.nix`: Hardware-specific configuration. It should
      not depend on any modules or files from this repository, since it is used
      for initial setup.
+   + `services`: Non-trivial machine-specific configuration related to a
+     specific service the machine provides.
  * `modules`: Custom modules. Many are activated by default, since I want them
    on all systems.
  * `pkgs`: My nixpkgs overlay