Delaware Diversified Income Fund

Delaware Diversified Income Fund (Fund)

DELAWARE GROUP® ADVISER FUNDS

Delaware Diversified Income Fund (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, “What are the Fund’s fees and expenses?”.

What are the Fund’s fees and expenses?

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Delaware Investments® Funds. More information about these and other discounts is available from your financial advisor, in the Fund’s prospectus under the section entitled “About your account,” and in the Fund’s statement of additional information under the section entitled “Purchasing Shares.”

Shareholder fees (fees paid directly from your investment)

Shareholder Fees Delaware Diversified Income Fund	Class A	Class B		Class C		Class R	Institutional Class
Maximum sales charge (load) imposed on purchases as a percentage of offering price	4.50%	none		none		none	none
Maximum contingent deferred sales charge (load) as a percentage of original purchase price or redemption price, whichever is lower	none	4.00%	[1]	1.00%	[1]	none	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Delaware Diversified Income Fund	Class A	Class B		Class C	Class R	Institutional Class
Management fees	0.44%	0.44%		0.44%	0.44%	0.44%
Distribution and Service (12b-1) Fees	0.25%	1.00%		1.00%	0.50%	none
Other expenses	0.21%	0.21%		0.21%	0.21%	0.21%
Total annual fund operating expenses	0.90%	1.65%		1.65%	1.15%	0.65%
Fee waivers and expense reimbursements		(0.75%)	[1]
Total annual fund operating expenses after fee waivers and expense reimbursements	0.90%	0.90%		1.65%	1.15%	0.65%

The following replaces the information in the section entitled, “Example.”

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the applicable Distributor’s expense waiver for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Delaware Diversified Income Fund (USD $)	1 year	3 years	5 years	10 years
Class A	538	724	926	1,508
Class B	492	672	976	1,690
Class C	268	520	897	1,955
Class R	117	365	633	1,398
Institutional Class	66	208	362	810

(if not redeemed)

Expense Example, No Redemption Delaware Diversified Income Fund (USD $)	1 year	3 years	5 years	10 years
Class B	92	447	826	1,690
Class C	168	520	897	1,955

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 April 4, 2014.

[1] If you redeem Class B shares during the first year after you buy them, you will pay a contingent deferred sales charge (CDSC) of 4.00%, which declines to 3.00% during the second year, 2.25% during the third year, 1.50% during the fourth and fifth years, 1.00% during the sixth year, and 0% thereafter. Class C shares redeemed within one year of purchase are subject to a 1.00% CDSC.

[1] The Fund's distributor, Delaware Distributors, L.P. (Distributor), has contracted to limit the Fund's Class B shares' 12b-1 fee to no more than 0.25% of average daily net assets from April 1, 2014 through March 31, 2015. These waivers and reimbursements may only be terminated by agreement of the Distributor and the Fund.