The attorney general, in place of or in addition to designating any portion of the statute law or state constitution to be so printed and mailed, may, if he deems proper, make a summary statement of the existing law or constitutional provisions upon the subject so far as necessary to inform the voters of the effect which the adoption or rejection of the question or proposition submitted to them will have upon such statute law or state constitution, and the mailing of such summary statement shall be a compliance with the provisions of this title.