Strategy. a. In the first paragraph of the section entitled Principal Investment Strategies " in the Summary Prospectus and Prospectus, the third, fourth and fifth sentences are deleted in their entirety and replaced with the following: If NRSROs assign different ratings for the same security, the Fund will use the higher rating for purposes of determining the credit quality. Debt securities in which the Fund may invest include all types of debt obligations such as U.S. government securities (including Treasury notes, and obligations, such as repurchase agreements, secured by such instruments), agency securities, corporate bonds, municipal bonds, instruments of non-U.S. issuers, asset-backed securities (ABS) (including collateralized debt and loan obligations, residential mortgage-backed securities, and commercial mortgage-backed securities), commercial paper, debentures, floating … Show more… a. In the first paragraph of the section entitled Principal Investment Strategies " in the Summary Prospectus and Prospectus, the third, fourth and fifth sentences are deleted in their entirety and replaced with the following: If NRSROs assign different ratings for the same security, the Fund will use the higher rating for purposes of determining the credit quality. Debt securities in which the Fund may invest include all types of debt obligations such as U.S. government securities (including Treasury notes, and obligations, such as repurchase agreements, secured by such instruments), agency securities, corporate bonds, municipal bonds, instruments of non-U.S. issuers, asset-backed securities (ABS) (including collateralized debt and loan obligations, residential mortgage-backed securities, and commercial mortgage-backed securities), commercial paper, debentures, floating rate bonds, and convertible corporate bonds. b. The following is added to the end of the first paragraph of the section entitled Principal Investment Strategies in the Summary Prospectus and Prospectus: The Fund may invest up to 10% of its net assets in underlying funds, including exchange-traded funds (ETFs), mutual funds and closed-end funds. The Fund may also invest in derivatives, such as futures, forwards, treasury futures, options, forward commitments and swap agreements, including interest rate, total return and credit default swaps to seek to enhance returns or reduce the risk of loss by hedging certain of its holdings or manage duration. The Fund generally expects to hedge any foreign currency exposure back to U.S. dollars. Show less