Please don't do that . You want to tell folks you overlooked pertinent data that could lower the value ? Begging for a board complaint much?
Imo not possible to head off an ROV by preemptive addressing it. An upset borrower or RE agent will demand it / or if from Fannie CU it is coming your way. However, it is a good idea to make a preemptive statement wrt comp choices. (or parameters used )
Here is a sample statement ( adapt for each assignment ) I write ( when I remember to lol )
" In addition to the comps on the grid in the appraisal, a number of additional area sales were considered and reviewed. The appraiser recognizes that there are other sales in the area of homes both lower and higher in price. They were not used as comps, because majority of lower price homes are smaller and less upgraded , and the higher price sales are substantially larger or have pools or water views."
This statement accomplishes several things : It puts reader on notice you already considered additional sales, and it explains why both lower or higher sales they might pull up were not included in appraisal. While this kind of statement can not stop every ROV it can prevent some of them, or make it easier to deal with if you do get one.