navsection: userguide
title: Arvados CWL Extensions
...
+{% comment %}
+Copyright (C) The Arvados Authors. All rights reserved.
+
+SPDX-License-Identifier: CC-BY-SA-3.0
+{% endcomment %}
Arvados provides several extensions to CWL for workflow optimization, site-specific configuration, and to enable access the Arvados API.