American Funds Mortgage Fund^®
Statement of Additional Information Supplement

July 1, 2013
(for statement of additional information dated November 1, 2012)

The following is added to the “Description of certain securities and investment techniques” section of the statement of additional information:

Interest rate swaps — The fund may enter into interest rate swaps in order to manage the interest rate sensitivity of the fund by increasing or decreasing the duration of the fund or a portion of the fund’s portfolio. An interest rate swap is an agreement between two parties to exchange or swap payments based on changes in an interest rate or rates. Typically, one interest rate is fixed and the other rate changes based on changes in a designated interest rate benchmark such as the London Interbank Offered Rate (LIBOR), prime rate or other benchmark. Interest rate swaps generally do not involve the delivery of securities or other principal amounts. Rather, cash payments are exchanged by the parties based on the application of the designated interest rates to a notional amount, which is the predetermined dollar principal of the trade upon which payment obligations are computed. Accordingly, the fund’s current obligation or right under the swap agreement is generally equal to the net amount to be paid or received under the swap agreement based on the relative value of the position held by each party. The fund will generally segregate assets with a daily value at least equal to the excess, if any, of the fund’s accrued obligations under the swap agreement over the accrued amount the fund is entitled to receive under the agreement.

The use of interest rate swaps involves certain risks, including losses if interest rate changes are not correctly anticipated by the fund’s investment adviser. To the extent the fund enters into bilaterally negotiated swap transactions, the fund will enter into swap agreements only with counterparties that meet certain credit standards; however, if a counterparty’s creditworthiness deteriorates rapidly and the counterparty defaults on its obligations under the swap agreement or declares bankruptcy, the fund may lose any amount it expected to receive from the counterparty. Certain interest rate swap transactions are currently subject to mandatory central clearing or may be eligible for voluntary central clearing. Because clearing interposes a central clearinghouse as the ultimate counterparty to each participant’s swap, central clearing is intended to decrease (but not eliminate) counterparty risk relative to uncleared bilateral swaps. Additionally, the term of an interest rate swap can be days, months or years and, as a result, certain swaps may be less liquid than others.

Keep this supplement with your statement of additional information.

Lit No. MFGEBSX-042-0613O CGD/10149-S39322