Divorce by mutual consent is a simple process of submitting a declaration to the relevant government office that says both spouses agree to divorce. This form is often called the "Green Form" due to the wide green band across the top. If both parties fail to reach agreement on conditions of a Divorce By Mutual Consent, such as child custody which must be specified on the divorce form, then they must use one of the other three types of divorce. Foreign divorces may also be registered in Japan by bringing the appropriate court documents to the local city hall along with a copy of the Family Registration of the Japanese ex-spouse. If an international divorce includes joint custody of the children, it is important to the foreign parent to register it themselves, because joint custody is not legal in Japan. The parent to register the divorce may thus be granted sole custody of the child according to Japanese law.