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+Building Documentation
+======================
+
+To create a rendered copy of this documentation locally you can use the
+`Sphinx`_ tool to build and package the plain-text documents into HTML-formatted
+pages.
+
+If you are building the documentation for the first time then you will need to
+check that you have the required software packages, as described in the
+*Prerequisites* section that follows.
+
+Prerequisites
+-------------
+
+For building a local copy of the |TS| documentation you will need, at minimum:
+
+- GNUMake
+- Python 3 (3.5 or later)
+- PlantUML (1.2017.15 or later)
+
+You must also install the Python modules that are specified in the
+``requirements.txt`` file in the root of the ``docs`` directory. These modules
+can be installed using ``pip3`` (the Python Package Installer). Passing this
+requirements file as an argument to ``pip3`` automatically installs the specific
+module versions required.
+
+Example environment
+-------------------
+
+An example set of installation commands for Linux with the following assumptions:
+    #. OS and version: Ubuntu 18.04 LTS
+    #. `virtualenv` is used to separate the python dependencies
+    #. pip is used for python dependency management
+    #. `bash` is used as the shell.
+
+.. code:: shell
+
+    sudo apt install make python3 python3-pip virtualenv python3-virtualenv plantuml
+    virtualenv -p python3 ~/sphinx-venv
+    . ~/sphinx-venv/bin/activate
+    pip3 install -r requirements.txt
+    deactivate
+
+.. note::
+   More advanced usage instructions for *pip* are beyond the scope of this
+   document but you can refer to the `pip homepage`_ for detailed guides.
+
+.. note::
+   For more information on Virtualenv please refer to the `Virtualenv documentation`_
+
+Building rendered documentation
+-------------------------------
+
+From the ``docs`` directory of the project, run the following commands.
+
+.. code:: shell
+
+   . ~/sphinx-venv/bin/activate
+   make clean
+   make SPHINXOPTS=-W html
+   deactivate
+
+Output from the build process will be placed in:
+
+::
+
+   <tf-a CMF root>/docs/_build/html/
+
+--------------
+
+.. _Sphinx: http://www.sphinx-doc.org/en/master/
+.. _pip homepage: https://pip.pypa.io/en/stable/
+.. _`Virtualenv documentation`: https://virtualenv.pypa.io/en/latest/
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause