The Fund generally will invest at least 80% of its total assets in securities that comprise the Underlying Index. Strictly in accordance with its guidelines and mandated procedures, Invesco Indexing LLC (the Index Provider) compiles and maintains the Underlying Index. The Index Provider is affiliated with Invesco Capital Management LLC, the Funds investment adviser Adviser), and Invesco Distributors, Inc., the Funds distributor (the Distributor). The Underlying Index seeks to measure the performance of a portfolio of U.S. dollar-denominated investment-grade municipal bonds with maturities or, in some cases, effective maturities, in the year 2034 (collectively, 2034 Bonds). Certain bonds in which the Fund may invest may contain embedded issuer call options. An embedded issuer call option means that the bond's issuer has the right to redeem a bond prior to its designated maturity date. Accordingly, the effective maturity date of a bond reflects an assessment of when that bond is likely to be called by the issuer, or in the alternate, the bond's stated maturity date (if it is not called by the issuer). With respect to establishing the effective maturity of a bond, the effective maturity is the actual year of maturity (i) if no embedded issuer call option exists for a bond; (ii) if a bond contains an embedded issuer call option, with the first call date within 13 months of maturity and a par call price; and (iii) unless the yield to next call date is less than the yield to maturity, in which case the bonds effective maturity is deemed to be the year of the next call date. The effective maturity of eligible pre-refunded municipal bonds with a known pre-refunded date shall be the year of the pre-refunded date.