def setup(app):
    app.add_crossref_type(
        directivename = "setting",
        rolename      = "setting",
        indextemplate = "pair: %s; setting",
    )
    app.add_crossref_type(
        directivename = "templatetag",
        rolename      = "ttag",
        indextemplate = "pair: %s; template tag"
    )
    app.add_crossref_type(
        directivename = "templatefilter",
        rolename      = "tfilter",
        indextemplate = "pair: %s; template filter"
    )
    app.add_crossref_type(
        directivename = "fieldlookup",
        rolename      = "lookup",
        indextemplate = "pair: %s; field lookup type",
    )
    app.add_description_unit(
        directivename = "decorator",
        rolename      = "dec",
        indextemplate = "pair: %s; function decorator",
    )