Mo. Rev. Stat. § 88.923: Notice of suit on special tax bills (cities, 300,000 or over).

Whenever any suit shall be commenced in any city of this state now having, or which may hereafter have a population of three hundred thousand or more inhabitants, on any special tax bill to enforce the payment or the lien thereof, the party or parties plaintiff shall, within ten days after the commencement of such suit, file with the comptroller or other officer of such city, in whose office the record of such special tax bills is required to be kept, a written notice setting forth when and in which court such suit was brought; and the comptroller or such other officer shall immediately note such facts on the record of such tax bill.