def _insert_rst_epilog(c):
    """Insert the rst_epilog variable into the configuration.

    This should be applied after other configurations so that the epilog can
    use other configuration variables.
    """
    # Substitutions available on every page
    c[
        "rst_epilog"
    ] = """
.. |eups-tag| replace:: {eups_tag}
.. |eups-tag-mono| replace:: ``{eups_tag}``
.. |eups-tag-bold| replace:: **{eups_tag}**
    """.format(
        eups_tag=c["release_eups_tag"]
    )

    return c