22 U.S.C. § 285z

(a) The United States Governor of the Bank is authorized to contribute on behalf of the United States $584,280,000 to the Asian Development Fund, a special Fund of the Bank, except that any commitment to make such contributions shall be made subject to obtaining the necessary appropriations. (b) In order to pay for the United States contribution provided for in subsection (a), there are authorized to be appropriated, without fiscal year limitation, $584,280,000 for payment by the Secretary of the Treasury.