def add_description(package, lines, line, i):
    """
    Add package description of a Description: line in a control file to
    the package dictionary, also update line index.

    Parameters
    package : dict, package information
    lines : list, control file lines
    line : str, current line
    i : int, line index
    """
    package["Description"] = line[13:].replace("\n", "<br/>")
    while True:
        i += 1
        # Description ends when Homepage or Original-Maintainer begins
        if "Homepage:" not in lines[i] and \
            "Original-Maintainer:" not in lines[i] and \
            lines[i] != "\n":
            package["Description"] += lines[i].replace("\n", "<br/>")
        else:
            break
    return package, i