diff --git a/README.md b/README.md
index d8e81c9e..92e0a9ab 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@ Optional:
 - [pyinotify >= 0.8.3](https://github.com/seb-m/pyinotify)
   - Linux >= 2.6.13
 - [gamin >= 0.0.21](http://www.gnome.org/~veillard/gamin)
+- [systemd >= 204](http://www.freedesktop.org/wiki/Software/systemd)
 
 To install, just do: