Okla. Stat. tit. 82, § 82-1108: Modification, amendment or extension of plan

The board of directors shall, from time to time after the

adoption of said official plan, have the power to modify, amend or

extend the same, provided that upon the making of any such

modification, amendment or extension thereof, the board of directors

shall cause notice to be given and shall conduct a hearing, all as

provided in Section 7 of this act, and shall not adopt any

modification, amendment, or extension until the notice has been

given and hearing held as herein provided.