Principal Funds 711 High Street, Des Moines, IA 50392 515 247 5111 tel www.principal.com

August 11, 2016

State Street Global Services Channel Center

1 Iron Street

Boston, MA 02210

Attention: Julie D. Fisher, Managing Director

Re: PRINCIPAL EXCHANGE-TRADED FUNDS (the"Trust'")

Ladies and Gentlemen:

Please be advised that the undersigned Fund has established two new series of shares to be known as Principal Millennials Index ETF and Principal Healthcare Innovators Index ETF, respectively (the "Portfolio(s)").

In accordance with Section 20.5, the Additional Portfolios provision, of the Custodian Agreement dated as of May 21, 2015, as amended, modified, or supplemented from time to time (the "Agreement"), by and among each registered investment company party thereto, and State Street Bank and Trust Company ("State Street"), the undersigned Fund hereby requests that State Street act as Custodian for the new Portfolio(s) under the terms of the Agreement. In connection with such request, the undersigned Fund hereby confirms, as of the date hereof, its representations and warranties set forth in Section 20.6 of the Agreement.

Please indicate your acceptance of the foregoing by executing two copies of this letter agreement, returning one to the Fund and retaining one for your records.

Sincerely,
PRINCIPAL EXCHANGE-TRADED FUNDS
	on behalf of:
	PRINCIPAL MILLENNIALS INDEX ET
	PRINCIPAL HEALTHCARE INNOVATORS INDEX ETF
By:	/s/ Layne A. Rasmussen
Name:	Layne A. Rasmussen
Title:	VP and Controller, Duly Authorized

Agreed and Accepted:
STATE STREET BANK AND TRUST COMPANY
By:	/s/ Andrew Erickson
Name:	Andrew Erickson
Title:	Executive Vice President, Duly Authorized
Effective Date: August 19, 2016