-PyDERASN depends on `six <https://pypi.org/project/six/>`__ package
-for keeping compatibility with Py27/Py35. It is included in the tarball.
-You can also find it mirrored on :ref:`download <download>` page.
-``termcolor`` is an optional dependency used for output colourizing.
-``urwid`` is an optional dependency used for :ref:`interactive browser <browser>`.
+* ``termcolor`` is an optional dependency used for output colourizing.
+* ``urwid`` is an optional dependency used for :ref:`interactive browser <browser>`.
+* ``dateutil`` is an optional dependency used for ``.totzdatetime()`` method.