MBS Mortgage LoansMBS Mortgage LoansMortgage Loan purchased by Fannie Mae in exchange for an issued MBS backed by the Mortgage Loan. may have special characteristics that require the preparation and delivery of Additional DisclosureAdditional DisclosurePart of the disclosure package published by Fannie Mae when issuing an MBS. documents which must be identified at the time of the CommitmentCommitmentContractual agreement between Fannie Mae and the Lender where Fannie Mae agrees to buy a Mortgage Loan from the Lender at a future date in exchange for an MBS, or at a specific price for a Cash Mortgage Loan, and the Lender agrees to Deliver that Mortgage Loan to Fannie Mae. request. See the Additional Disclosure Guidance (Form 4098) for a list of such characteristics.