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+Adding Documentation
+--------------------
+
+To add new documentation, define the ``SPHINX_TREES`` and
+``SPHINX_PYTHON_PACKAGE_DIRS`` variables in ``moz.build`` files in
+the tree and documentation will automatically get picked up.
+
+Say you have a directory ``featureX`` you would like to write some
+documentation for. Here are the steps to create Sphinx documentation
+for it:
+
+1. Create a directory for the docs. This is typically ``docs``. e.g.
+   ``featureX/docs``.
+2. Create an ``index.rst`` file in this directory. The ``index.rst`` file
+   is the root documentation for that section. See ``build/docs/index.rst``
+   for an example file.
+3. In a ``moz.build`` file (typically the one in the parent directory of
+   the ``docs`` directory), define ``SPHINX_TREES`` to hook up the plumbing.
+   e.g. ``SPHINX_TREES['featureX'] = 'docs'``. This says *the ``docs``
+   directory under the current directory should be installed into the
+   Sphinx documentation tree under ``/featureX``*.
+4. If you have Python packages you would like to generate Python API
+   documentation for, you can use ``SPHINX_PYTHON_PACKAGE_DIRS`` to
+   declare directories containing Python packages. e.g.
+   ``SPHINX_PYTHON_PACKAGE_DIRS += ['mozpackage']``.
+5. In ``docs/config.yml``, defines in which category the doc
+   should go.
+6. Verify the rst syntax using `./mach lint -l rst`_
+
+.. _./mach lint -l rst: /tools/lint/linters/rstlinter.html