Appraisal contingency waived for VA/FHA

For VA/FHA loans, if my buyer agrees to waive the appraisal contingency and appraisal comes up 10K short then they can pay the extra 10K difference, plus whatever else is needed to close, to get it done??? Gonna push my price a little on my flip I'm about to list and wanted to see what some of you BP guys/girls have to say about this. I believe it could still appraise for the price I'm gonna ask but not a lot of support with actual sales prices of apples to apples properties in the area, but my property is much nicer with more upgrades than the other properties sold. Anyways, property is located in Southern California and not exactly sure about VA/FHA rules on making up the difference of appraisal to close the deal if appraisal waived.