.. _yaml_version_head:

Version Header for YAML Files
*****************************

The ``version`` header is an **optional** section where we define the language specification version of our YAML files.

The header provides a means to ensure that your YAML file will be supported by the version of YANK you are running on.

.. code-block:: yaml

    version: 1.2

Valid Options: [1.0, 1.1, 1.2]