DELAWARE GROUP® ADVISER FUNDS

Delaware U.S. Growth Fund (the “Fund”)

Supplement to the Fund’s Class A, Class B, Class C, Class R, and Institutional Class

Statutory Prospectus dated February 28, 2014

The following replaces the information in the section entitled “Fund summary – Who manages the Fund? – Investment manager”:

Investment manager

Delaware Management Company, a series of Delaware Management Business Trust

Sub-advisor

Jackson Square Partners, LLC (JSP)

Portfolio managers	Title with JSP	Start date on the Fund
Jeffrey S. Van Harte, CFA	Chairman, Chief Investment Officer	April 2005
Christopher J. Bonavico, CFA	Portfolio Manager, Equity Analyst	April 2005
Daniel J. Prislin, CFA	Portfolio Manager, Equity Analyst	April 2005
Christopher M. Ericksen, CFA	Portfolio Manager, Equity Analyst	September 2005

The following replaces the information in the section entitled “Who manages the Fund – Investment manager”:

Sub-advisor

Jackson Square Partners, LLC (JSP), located at 101 California Street, Suite 3750, San Francisco, CA 94111, is the sub-advisor to the Fund. JSP, a Delaware limited liability company, is a joint venture between Delaware Investments Advisers Partner, Inc., an affiliate of the Manager, and California Street Partners, LLC, a Delaware limited liability company owned by certain JSP personnel. As of May 1, 2014, JSP manages over $25 billion in assets, including mutual funds, separate accounts and other investment vehicles. As sub-advisor, JSP is responsible for day-to-day management of the Fund’s assets. Although JSP serves as sub-advisor, the Manager has ultimate responsibility for all investment advisory services with JSP. The Manager has entered into a separate sub-advisory agreement with JSP and compensates JSP out of the investment advisory fees it receives from the Fund.

The following replaces the information in the section entitled “Who manages the Fund – Portfolio managers”:

Portfolio managers

The portfolio managers share responsibility for making day-to-day investment decisions for the Fund.

Jeffrey S. Van Harte, CFA, Chairman, Chief Investment Officer – Jackson Square Partners, LLC

Jeffrey S. Van Harte became a member of Jackson Square Partners (JSP), at its inception in May 2014 as chairman and chief investment officer. Jackson Square Partners manages large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to joining to joining JSP, he was the chief investment officer of Delaware Investments’ Focus Growth Equity team from April 2005 to April 2014. The Focus Growth Equity team managed large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to Delaware Investments, he was a principal and executive vice president at Transamerica Investment Management. Van Harte has been managing portfolios and separate accounts for 30 years. Before becoming a portfolio manager, Van Harte was a securities analyst and trader for Transamerica Investment Services, which he joined in 1980. Van Harte received his bachelor’s degree in finance from California State University at Fullerton.

Christopher J. Bonavico, CFA, Portfolio Manager, Equity Analyst – Jackson Square Partners, LLC

Christopher J. Bonavico became a member of Jackson Square Partners (JSP), at its inception in May 2014 as a portfolio manager and equity analyst. Jackson Square Partners manages large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to joining JSP, he was a portfolio manager and equity analyst on Delaware Investments’ Focus Growth Equity team from April 2005 to April 2014. The Focus Growth Equity team managed large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to Delaware Investments, he was a principal and portfolio manager at Transamerica Investment Management, where he managed sub-advised funds and institutional separate accounts. Before joining Transamerica in 1993, he was a research analyst for Salomon Brothers. Bonavico received his bachelor’s degree in economics from the University of Delaware.

Daniel J. Prislin, CFA, Portfolio Manager, Equity Analyst – Jackson Square Partners, LLC

Daniel J. Prislin became a member of Jackson Square Partners (JSP), at its inception in May 2014 as a portfolio manager and equity analyst. Jackson Square Partners manages large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to joining JSP, he was a portfolio manager and equity analyst on Delaware Investments’ Focus Growth Equity team from April 2005 to April 2014. The Focus Growth Equity team managed large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to joining Delaware Investments, he was a principal and portfolio manager at Transamerica Investment Management, where he also managed sub-advised funds and institutional separate accounts. Prior to joining Transamerica in 1998, he was a portfolio manager with The Franklin Templeton Group. Prislin received an MBA and bachelor’s degree in business administration from the University of California at Berkeley.

Christopher M. Ericksen, CFA, Portfolio Manager, Equity Analyst – Jackson Square Partners, LLC

Christopher M. Ericksen became a member of Jackson Square Partners (JSP), at its inception in May 2014 as a portfolio manager and equity analyst. Jackson Square Partners manages large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to joining JSP, he was a portfolio manager and equity analyst on Delaware Investments’ Focus Growth Equity team from April 2005 to April 2014. The Focus Growth Equity team managed large-cap growth, smid-cap growth, all-cap growth, and global growth portfolios. Prior to joining Delaware Investments, he was a portfolio manager at Transamerica Investment Management, where he also managed institutional separate accounts. Before joining Transamerica in 2004, he was a vice president at Goldman Sachs. During his 10 years there, he worked in investment banking as well as investment management. Ericksen received his bachelor’s degree from Carnegie Mellon University, with majors in industrial management, economics, and political science.

The SAI provides additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of Fund shares.

Investments in the Fund are not and will not be deposits with or liabilities of Macquarie Bank Limited ABN 46 008 583 542 and its holding companies, including their subsidiaries or related companies (the "Macquarie Group"), and are subject to investment risk, including possible delays in repayment and loss of income and capital invested. No Macquarie Group company guarantees or will guarantee the performance of the Fund, the repayment of capital from the Fund, or any particular rate of return.

Please keep this Supplement for future reference.

This Supplement is dated May 20, 2014.