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+More Sphinx customization
+=========================
+
+There are two main ways to customize your documentation beyond what is possible
+with core Sphinx: extensions and themes.
+
+Enabling a built-in extension
+-----------------------------
+
+In addition to these configuration values, you can customize Sphinx even more
+by using :doc:`extensions </usage/extensions/index>`.  Sphinx ships several
+:ref:`builtin ones <builtin-extensions>`, and there are many more
+:ref:`maintained by the community <third-party-extensions>`.
+
+For example, to enable the :mod:`sphinx.ext.duration` extension,
+locate the ``extensions`` list in your ``conf.py`` and add one element as
+follows:
+
+.. code-block:: python
+   :caption: docs/source/conf.py
+
+   # Add any Sphinx extension module names here, as strings. They can be
+   # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+   # ones.
+   extensions = [
+       'sphinx.ext.duration',
+   ]
+
+After that, every time you generate your documentation, you will see a short
+durations report at the end of the console output, like this one:
+
+.. code-block:: console
+
+   (.venv) $ make html
+   ...
+   The HTML pages are in build/html.
+
+   ====================== slowest reading durations =======================
+   0.042 temp/source/index
+
+Using a third-party HTML theme
+------------------------------
+
+Themes, on the other hand, are a way to customize the appearance of your
+documentation.  Sphinx has several :ref:`builtin themes <builtin-themes>`, and
+there are also `third-party ones <https://sphinx-themes.org/>`_.
+
+For example, to use the `Furo <https://pradyunsg.me/furo/>`_ third-party theme
+in your HTML documentation, first you will need to install it with ``pip`` in
+your Python virtual environment, like this:
+
+.. code-block:: console
+
+   (.venv) $ pip install furo
+
+And then, locate the ``html_theme`` variable on your ``conf.py`` and replace
+its value as follows:
+
+.. code-block:: python
+   :caption: docs/source/conf.py
+
+   # The theme to use for HTML and HTML Help pages.  See the documentation for
+   # a list of builtin themes.
+   #
+   html_theme = 'furo'
+
+With this change, you will notice that your HTML documentation has now a new
+appearance:
+
+.. figure:: /_static/tutorial/lumache-furo.png
+   :width: 80%
+   :align: center
+   :alt: HTML documentation of Lumache with the Furo theme
+
+   HTML documentation of Lumache with the Furo theme
+
+It is now time to :doc:`expand the narrative documentation and split it into
+several documents </tutorial/narrative-documentation>`.