The Fund seeks to achieve its investment objective by investing in a broad range of U.S. dollar-denominated money market instruments, including government, U.S. and foreign bank, and commercial obligations and repurchase agreements. Under normal conditions, the Fund will invest at least 80% of the value of its net assets, plus the amount of any borrowings for investment purposes, in securities whose issuer or guarantor, in the opinion of BlackRock, the Fund’s investment manager, at the time of purchase, meets the Fund’s environmental criteria. This policy is a nonfundamental policy of the Fund. However, the Fund will provide shareholders with at least 60 days’ prior written notice of any changes to the policy.