-``termcolor`` is an optional dependency used for output colourizing.
-``urwid`` is an optional dependency used for :ref:`interactive browser <browser>`.
-
-You could use pip (**no** OpenPGP authentication is performed!) with PyPI::
-
- $ echo pyderasn==9.0 --hash=sha256:TO-BE-FILLED > requirements.txt
- $ pip install --requirement requirements.txt
+* ``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.