@classmethod
def get_business_non_required_fields(cls):
    """
        Get ``set`` of ``non required fields`` for :attr:`.BUSINESS_TYPE`

        Returns:
            ``set`` of fields
        """
    fields = cls.get_non_required_fields()
    return fields.union(super().get_business_non_required_fields(), {
        'business_description', 'business_facebook', 'business_twitter'})
