; and (2) by inserting after paragraph (3) the following new paragraph: (4) The head of an agency shall document the results of market research in a manner appropriate to the size and complexity of the acquisition. . (b) Conforming amendment related to prospective amendment Section 836(d)(3)(C)(ii) of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 ( Public Law 115–232 ) is amended by striking in paragraph (4) and inserting in paragraph (5) . 810. Modification to small purchase threshold exception to sourcing requirements for certain articles Subsection (h) of section 2533a of title 10, United States Code, is amended to read as follows: (h) Exception for small purchases Subsection (a) does not apply to purchases for amounts not greater than $150,000. A proposed purchase or contract for an amount greater than $150,000 may not be divided into several purchases or contracts for lesser amounts in order to qualify for this exception. On October 1 of each year evenly divisible by 5, the Secretary of Defense may adjust the dollar threshold in this subsection based on changes in the Consumer Price Index. The Secretary shall publish notice of any such adjustment in the Federal Register, and the new price threshold shall take effect on the date of publication. . B Provisions relating to major defense acquisition programs 821. Naval vessel certification required before Milestone B approval Section 2366b(a) of title 10, United States Code, is amended— (1) in paragraph (3)(O), by striking ; and and inserting a semicolon; (2) in paragraph (4), by striking the period at the end and inserting ; and