def add_custom_options(parser):
    """Adds custom options to a parser.

    :param parser: the parser to which to add options.

    :type parser: argparse.ArgumentParser

    """
    parser.add_argument("--report-title", type=str, metavar="TITLE",
                        default="Genetic Data Clean Up",
                        help="The report title. [default: %(default)s]")
    parser.add_argument("--report-author", type=str, metavar="AUTHOR",
                        default="pyGenClean",
                        help="The current project number. "
                             "[default: %(default)s]")
    parser.add_argument("--report-number", type=str, metavar="NUMBER",
                        default="Simple Project",
                        help="The current project author. "
                             "[default: %(default)s]")
    parser.add_argument("--report-background", type=str, metavar="BACKGROUND",
                        default="The aim of this project is to perform data "
                                "QC prior to genetic analysis.",
                        help="Text of file containing the background section "
                             "of the report.")