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+==========
+Extensions
+==========
+
+Since many projects will need special features in their documentation, Sphinx
+allows adding "extensions" to the build process, each of which can modify
+almost any aspect of document processing.
+
+This chapter describes the extensions bundled with Sphinx.  For the API
+documentation on writing your own extension, refer to :ref:`dev-extensions`.
+
+
+.. _builtin-extensions:
+
+Built-in extensions
+-------------------
+
+These extensions are built in and can be activated by respective entries in the
+:confval:`extensions` configuration value:
+
+.. toctree::
+
+   autodoc
+   autosectionlabel
+   autosummary
+   coverage
+   doctest
+   duration
+   extlinks
+   githubpages
+   graphviz
+   ifconfig
+   imgconverter
+   inheritance
+   intersphinx
+   linkcode
+   math
+   napoleon
+   todo
+   viewcode
+
+
+.. _third-party-extensions:
+
+Third-party extensions
+----------------------
+
+You can find several extensions contributed by users in the `sphinx-contrib`__
+organization. If you wish to include your extension in this organization,
+simply follow the instructions provided in the `github-administration`__
+project. This is optional and there are several extensions hosted elsewhere.
+The `awesome-sphinxdoc`__ project contains a curated list of Sphinx packages,
+and many packages use the `Framework :: Sphinx :: Extension`__ and
+`Framework :: Sphinx :: Theme`__ trove classifiers for Sphinx extensions and
+themes, respectively.
+
+.. __: https://github.com/sphinx-contrib/
+.. __: https://github.com/sphinx-contrib/github-administration
+.. __: https://github.com/yoloseem/awesome-sphinxdoc
+.. __: https://pypi.org/search/?c=Framework+%3A%3A+Sphinx+%3A%3A+Extension
+.. __: https://pypi.org/search/?c=Framework+%3A%3A+Sphinx+%3A%3A+Theme
+
+Where to put your own extensions?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Extensions local to a project should be put within the project's directory
+structure.  Set Python's module search path, ``sys.path``, accordingly so that
+Sphinx can find them.  For example, if your extension ``foo.py`` lies in the
+``exts`` subdirectory of the project root, put into :file:`conf.py`::
+
+   import sys, os
+
+   sys.path.append(os.path.abspath('exts'))
+
+   extensions = ['foo']
+
+You can also install extensions anywhere else on ``sys.path``, e.g. in the
+``site-packages`` directory.