diff --git a/README.md b/README.md
index 070cd52..083b151 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ License: [GPL](http://www.gnu.org/licenses/gpl.html) v3
 Dependencies:
 
 * [Python](http://www.python.org) 3
+* [python-dateutil](https://pypi.org/project/python-dateutil/)
 * [GTK](http://www.gtk.org) 3 (>= 3.22) ([python-gobject](https://live.gnome.org/PyGObject))
 * [Avahi](http://www.avahi.org) (optional)
 * [python-keyring](http://pypi.python.org/pypi/keyring) (optional)