After marriage, a premarital agreement may be amended or revoked only by a written agreement signed by the parties. The amended agreement or the revocation is enforceable without consideration.
S.D. Codified Laws § 25-2-20
Amendment--Revocation
Known as the Uniform Premarital Agreement Act
The act spans §§ 25–25 (25 sections).
Source: SL 1989, ch 216, § 5.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.