This Supplement supplements the Pricing Supplement dated August 06, 2012, and relates to the Debt Securities described below (the "Notes"). You should read it together with the Offering Circular dated May 09, 2012 (the "Offering Circular"), relating to the Universal Debt Facility of the Federal National Mortgage Association ("Fannie Mae"). Unless defined below, capitalized terms have the meanings we gave to them in the Offering Circular.

The Notes offered by this Supplement, when issued, will form a single issue with the $50,000,000.00 aggregate principal amount of such Notes (the "Outstanding Notes") that we issued in one or more prior transactions. With the exception of the terms set forth below, the Notes will have the terms set forth in the Pricing Supplement dated August 06, 2012, a copy of which is attached.

The Notes, together with interest thereon, are not guaranteed by the United States and do not constitute a debt or obligation of the United States or of any agency or instrumentality thereof other than Fannie Mae.

Certain Securities Terms

1.

Title: Step Rate Notes Due August 22, 2017

2.

Aggregate Principal Amount: $50,000,000.00 ($100,000,000.00 aggregate principal amount outstanding when combined with the Outstanding Notes)

3.

Issue Date: August 22, 2012

Offering

1.

Pricing Date:

August 07, 2012

2.

Method of Distribution:

X Principal

__ Non-underwritten

3.

The following dealers have agreed, jointly and severally, to purchase all of the Notes:

First Tennessee Bank National Association

Citigroup Global Markets Inc.

a.

Representative(s):

First Tennessee Bank National Association

b.

Stabilizing Manager:

First Tennessee Bank National Association

4.

Offering Price:

X

Fixed Offering Price: 100.00% of principal amount, plus accrued interest, if any, from August 22, 2012

__

Variable Price Offering

5.

Dealer Purchase Price: 99.88% of principal amount, plus accrued interest, if any, from August 22, 2012

a.

Concession:

N/A

b.

Reallowance:

N/A

6.

Proceeds to Fannie Mae:

$49,940,000.00

Settlement

1.

Settlement Date:

August 22, 2012