The Fund invests at least 80% of its total assets in the securities of the Underlying Index. The Fund's 80% investment policy is non-fundamental and requires 60 days prior written notice to shareholders before it can be changed. The Underlying Index measures the performance of a theoretical portfolio that holds a portfolio of the stocks included in the S&P 500 Index (the Reference Index), and writes (or sells) a succession of one-month at-the-money covered call options on the Reference Index. The written covered call options on the Reference Index correspond to approximately 50% of the value of the portfolio of stocks in the Reference Index. The written covered call options on the Reference Index are held until expiration. The Reference Index is a float-adjusted market capitalization weighted index which measures the performance of the equity securities of 500 industrial, information technology, utility and financial companies amongst other GICS sectors, regarded as generally representative of the U.S. stock market. A float-adjusted market capitalization weighted index weights each index component according to its market capitalization, using the number of shares that are readily available for purchase on the open market. In seeking to track the Underlying Index, the Fund follows a buy-write investment strategy on the Reference Index in which the Fund purchases the component securities of the Reference Index and also writes (or sells) call options that correspond to approximately 50% of the value of the portfolio of stocks in the Reference Index. By only writing call options on approximately 50% of the value of the portfolio of stocks in the Reference Index, the strategy can provide income generation from the call options while allowing for some potential upside exposure to the growth of the underlying constituents of the Reference Index, relative to a 100% covered call strategy.