def add_to_dictionary(dictionary, key, value1, value2):
    """
    Add key: [value1, value2] to dictionary.

    :param dictionary: dictionary to be updated.
    :param key: key to be added (string).
    :param value1: value1 to be added to list belonging to key.
    :param value1: value2 to be added to list belonging to key.
    :return: updated dictionary.
    """

    dictionary[key] = [value1, value2]
    return dictionary