When the holder of a deed to secure debt or a mortgage forecloses the same and sells the real property thereby secured under the laws of this state governing foreclosures and sales under power and the purchaser thereof presents to the clerk of the superior court his deed under power to have the same recorded, the clerk shall write in the margin of the page where the deed to secure debt or mortgage foreclosed upon is recorded the word "foreclosed" and the deed book and page number on which is recorded the deed under power conveying the real property; provided, however, that, in counties where the clerk keeps the records affecting real estate on microfilm, the notation provided for in this Code section shall be made in the same manner in the index or other place where the clerk records transfers and cancellations of deeds to secure debt.