Okla. Stat. tit. 18, § 1008

CERTIFICATE OF INCORPORATION; DEFINITION The term "certificate of incorporation", as used in the Oklahoma General Corporation Act, unless the context requires otherwise, includes not only the original certificate of incorporation filed to create a corporation but also all other certificates, agreements of merger or consolidation, plans of reorganization, or other instruments, howsoever designated, which are filed pursuant to the provisions of Sections 1006, 1023 through 1026, 1032, 1076 through 1087, 1090.2, or 1118 through 1120 of this title, or any other section of this title, and which have the effect of amending or supplementing in some respect a corporation's certificate of incorporation.