I didn't have an appraisal in my addendum but my bank had this in their approval letter:
My loan pre-approval states 'Subject to the approval of at least: $240,000.
Here is the relevant purchase agreement and addendum:
The Mortgage Contingency states: If the buyer cannot secure the financing specified in this Purchase Agreement, and this Purchase Agreement does not close on the closing date specified, this Purchase Agreement is canceled. Buyer and Seller shall immediate sign a Cancellation of Purchase Agreement confirming said cancellation and directing all earnest money to be refunded to the Buyer.