def generate_documentation(schema):
    """
    Generates reStructuredText documentation from a Confirm file.

    :param schema: Dictionary representing the Confirm schema.

    :returns: String representing the reStructuredText documentation.
    """

    documentation_title = "Configuration documentation"
    documentation = documentation_title + "\n"
    documentation += "=" * len(documentation_title) + '\n'

    for section_name in schema:
        section_created = False

        for option_name in schema[section_name]:

            option = schema[section_name][option_name]

            if not section_created:
                documentation += '\n'
                documentation += section_name + '\n'
                documentation += '-' * len(section_name) + '\n'
                section_created = True

            documentation += '\n'
            documentation += option_name + '\n'
            documentation += '~' * len(option_name) + '\n'

            if option.get('required'):

                documentation += "** This option is required! **\n"

            if option.get('type'):

                documentation += '*Type : %s.*\n' % option.get('type')

            if option.get('description'):

                documentation += option.get('description') + '\n'

            if option.get('default'):

                documentation += 'The default value is %s.\n' % option.get('default')

            if option.get('deprecated'):

                documentation += "** This option is deprecated! **\n"

    return documentation