Supplement to the currently effective Statements of Additional Information for
the listed fund:


DWS Short Duration Fund

--------------------------------------------------------------------------------

The following supplements similar disclosure under "Bank Loans" in the
"Investment Policies and Techniques" section of the fund's Statements of
Additional Information:

Bank Loans. DWS High Income Plus Fund and DWS Short Duration Fund may also
invest in bank loans, which are typically senior debt obligations of borrowers
(issuers) and, as such, are considered to hold a senior position in the capital
structure of the borrower.


The following supplements similar disclosure under "Lower Quality Debt
Obligations - Junk Bonds" in the "Investment Policies and Techniques" section of
the fund's Statements of Additional Information:

Lower Quality Debt Obligations - Junk Bonds. DWS High Income Plus Fund may
invest in below investment grade bonds, including securities in default (DWS
Short Duration Fund may invest up to 10% of net assets in such securities and
DWS Core Fixed Income Fund may invest up to 5% of net assets in such
securities).


The following supplements similar disclosure under "Foreign Securities" in the
"Investment Policies and Techniques" section of the fund's Statements of
Additional Information:

Foreign Securities. Subject to their respective investment objectives and
policies, each of the Funds may invest in securities of foreign issuers and
supranational entities. While the non-US investments of both DWS High Income
Plus Fund and DWS Short Duration Fund may be denominated in any currency, the
investments of DWS Core Fixed Income Fund in foreign securities may be
denominated only in the US dollar.


The following supplements similar disclosure under "Investment in Emerging
Markets" in the "Investment Policies and Techniques" section of the fund's
Statements of Additional Information:

Investment in Emerging Markets. DWS High Income Plus Fund and DWS Short Duration
Fund may invest to varying degrees in one or more countries with emerging
securities markets.


The following supplements similar disclosure under "Swaps, Caps, Floors and
Collars" in the "Investment Policies and Techniques" section of the fund's
Statements of Additional Information:

DWS High Income Plus Fund and DWS Core Fixed Income Fund may invest up to 15% of
their total assets in credit default swaps (based on the notional amount of the
swap) for both hedging and non-hedging purposes. DWS Short Duration Fund may
also invest in credit default swaps for both hedging and non-hedging purposes. A
credit default swap is a contract between a buyer and a seller of protection
against a pre-defined credit event. The buyer of protection pays the seller a
fixed regular fee provided that no event of default on an underlying reference
obligation has occurred. If an event of default occurs, the seller must pay the
buyer the full notional value, or "par value," of the reference obligation in
exchange for the reference obligation. Credit default swaps are used as a means
of "buying" credit protection, i.e., attempting to mitigate the risk of default
or credit quality deterioration in some portion of a Fund's holdings, or
"selling" credit protection, i.e., attempting to gain exposure to an underlying
issuer's credit quality characteristics without directly investing in that
issuer. For DWS High Income Plus Fund and DWS Core Fixed Income Fund, no more
than 5% of a Fund's assets may be invested in credit default swaps for purposes
of buying credit protection if the Fund does not own the underlying security or
securities at the time of investment. Where a Fund is a seller of credit
protection, it effectively adds leverage to its portfolio because, in addition
to its total net assets, the Fund would be subject to investment exposure on the
notional amount of the swap. A Fund will only sell credit protection with
respect to securities in which it would be authorized to invest directly. Each
Fund currently considers credit default swaps to be illiquid and treats the
market value of the contract as illiquid for purposes of determining compliance
with the Fund's restrictions on investing in illiquid securities.



<PAGE>

The following supplements disclosure set forth in the chart of types of
securities and investment strategies under "Summary of Investment Practices" in
the "Investment Policies and Techniques" section of the fund's Statements of
Additional Information:

The following entries under DWS Short Duration Fund are amended as noted below:


<TABLE>
<S>                                             <C>
Lower-Rated Debt Securities:                    10%   investment limitation as a percentage of net fund assets)

Credit Default Swaps:                           +     permitted without limit)

Asset-Backed Securities:                        +     permitted without limit)

Foreign Securities & Depository Receipts:       25%   (investment limitation as a percentage of total fund assets)
                                                      (securities may be denominated in any currency)

Foreign Corporate Debt Securities:              25%   (investment limitation as a percentage of total fund assets)
                                                      (securities may be denominated in any currency)

Foreign Government Debt Securities:             25%   (investment limitation as a percentage of total fund assets)
                                                      (securities may be denominated in any currency)

Investments in Emerging Markets:                10%   (investment limitation as a percentage of total fund assets)
                                                      (securities may be denominated in any currency)
</TABLE>


The following note is amended to read as follows:

* DWS Core Fixed Income Fund has a 15% of total assets combined limit on futures
and interest rate swaps.


The following supplements information under "Subadvisor for DWS Core Fixed
Income Fund and DWS Short Duration Fund" in the "Investment Advisor" section of
the fund's Statements of Additional Information:

On September 19, 2008 the DWS Short Duration Fund's Board approved the
termination of Aberdeen Asset Management Inc. ("AAMI") as the subadvisor to DWS
Short Duration Fund. Effective December 1, 2008, the Advisor will assume all
day-to-day advisory responsibilities for DWS Short Duration Fund that were
previously delegated to AAMI.

The following information supplements and replaces similar information for the
entire portfolio management team contained in the "Management of the Fund"
section of the fund's Statements of Additional Information.

Fund Ownership of Portfolio Managers

The following table shows the dollar range of shares owned beneficially and of
record by each member of the DWS Short Duration Fund's portfolio management team
in the DWS Short Duration Fund as well as in all DWS Funds as a group (i.e.,
those funds advised by Deutsche Asset Management or its affiliates), including
investments by their immediate family members sharing the same household and
amounts invested through retirement and deferred compensation plans. This
information is provided as of September 30, 2008.

<PAGE>

<TABLE>
<CAPTION>
          Name of            Dollar Range of DWS Short Duration            Dollar Range Of
     Portfolio Manager                Fund Shares Owned               All DWS Fund Shares Owned
     -----------------                -----------------               -------------------------

<S>                                         <C>                          <C>
William Chepolis                            None                         $100,001 - $500,000
Matthew F. MacDonald                        None                           $10,001 - 50,000
Gary Sullivan                               None                          $50,001 - 100,000
Eric S. Meyer                               None                                 None
</TABLE>

Conflicts of Interest

In addition to managing the assets of the DWS Short Duration Fund, the DWS Short
Duration Fund's portfolio managers may have responsibility for managing other
client accounts of the Advisor or its affiliates. The tables below show, for
each portfolio manager, the number and asset size of (1) SEC registered
investment companies (or series thereof) other than the DWS Short Duration Fund,
(2) pooled investment vehicles that are not registered investment companies and
(3) other accounts (e.g., accounts managed for individuals or organizations)
managed by each portfolio manager. Total assets attributed to each portfolio
manager in the tables below include total assets of each account managed by
them, although the manager may only manage a portion of such account's assets.
The tables also show the number of performance based fee accounts, as well as
the total assets of the accounts for which the advisory fee is based on the
performance of the account. This information is provided as of September 30,
2008.

Other SEC Registered Investment Companies Managed:

<TABLE>
<CAPTION>
                               Number of                                 Number of Investment
                              Registered         Total Assets of        Company Accounts with     Total Assets of
Name of                       Investment      Registered Investment          Performance-           Performance-
Portfolio Manager              Companies            Companies                 Based Fee          Based Fee Accounts
-----------------              ---------            ---------                 ---------          ------------------

<S>                               <C>            <C>                              <C>                    <C>
William Chepolis                  17             $8,975,916,522                   0                      $0
Matthew F. MacDonald              15             $8,909,056,517                   0                      $0
Gary Sullivan                     12             $6,844,578,954                   0                      $0
Eric S. Meyer                      2             $1,776,633,807                   0                      $0



Other Pooled Investment Vehicles Managed:

                                                                           Number of Pooled
                               Number of                                  Investment Vehicle
                                Pooled                                      Accounts with         Total Assets of
Name of                       Investment     Total Assets of Pooled          Performance-           Performance-
Portfolio Manager              Vehicles        Investment Vehicles            Based Fee          Based Fee Accounts
-----------------              --------        -------------------            ---------          ------------------

William Chepolis                 0                     $0                         0                     $0
Matthew F. MacDonald             0                     $0                         0                     $0
Gary Sullivan                    0                     $0                         0                     $0
Eric S. Meyer                    5               $1,701,178,221                   1                $261,474,067

Other Accounts Managed:

                                                                           Number of Other
                               Number of                                    Accounts with         Total Assets of
Name of                          Other           Total Assets of             Performance-           Performance-
Portfolio Manager              Accounts          Other Accounts               Based Fee          Based Fee Accounts
-----------------              --------          --------------               ---------          ------------------

William Chepolis                1                 $116,697,183                    0                     $0
Matthew F. MacDonald             1                $116,697,183                    0                     $0

<PAGE>

                                                                           Number of Other
                               Number of                                    Accounts with         Total Assets of
Name of                          Other           Total Assets of             Performance-           Performance-
Portfolio Manager              Accounts          Other Accounts               Based Fee          Based Fee Accounts
-----------------              --------          --------------               ---------          ------------------

Gary Sullivan                    0                     $0                         0                     $0
Eric S. Meyer                    0                     $0                         0                     $0

</TABLE>




               Please Retain This Supplement for Future Reference


December 1, 2008