diff --git a/docs/requirements.txt b/docs/requirements.txt
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+#
+# Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# Python dependencies for building the documentation.
+
+Sphinx==2.3.1
+sphinx-rtd-theme==0.4.3
+sphinxcontrib-moderncmakedomain==3.13
+sphinxcontrib-plantuml==0.18