The exercise of the power to distribute the income or principal of the trust under § 55-2-15 shall be by an instrument in writing, signed and acknowledged by the trustee and filed with the records of the trust. The trustee of the first trust may notify the beneficiaries of the first trust, in writing, prior to the effective date of the trustee's exercise of the power under § 55-2-15 (applying chapter 55-18). A copy of the exercise of this authority and the second trust agreement shall satisfy this notice provision. For the purposes of this section, the term, beneficiaries, means those persons who would be entitled to notice and a copy of the first trust instrument under § 55-2-13.
SDCL 55-2-18