Ala. Code § 35-10-21

The owner or holder of any recorded lien other than those specified in section 35-10-22, who has received payment in full or partial payments of the debt so secured by the recorded lien, must, upon request in writing, enter on the margin of the record of such recorded lien, the amount and date of such payment and the amount of the debt which remains unpaid at that date which was so secured by the recorded lien.