SUPPLEMENT TO THE CURRENTLY EFFECTIVE PROSPECTUSES:

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

                         DWS Commodity Securities Fund


The following information supplements the section of the above-named fund's
prospectuses titled "The Fund's Main Investment Strategy"

DWS Commodity Securities Fund (the "fund") intends to gain exposure to the
commodity markets by investing a portion of its assets in a wholly-owned
subsidiary organized under the laws of the Cayman Islands (the "Subsidiary").
Among other investments, the Subsidiary is expected to invest in
commodity-linked derivative instruments, such as swaps and futures. The
Subsidiary will also invest in debt securities, some of which are intended to
serve as margin or collateral for the Subsidiary's derivatives positions. The
Subsidiary may also invest available cash in affiliated money market funds. The
Subsidiary is managed by the same portfolio managers that manage the fund.

The following information supplements the section of the above-named fund's
prospectuses titled "Who Manages and Oversees the Fund -- The investment
advisor"

The fund may pursue its investment objective, in part, by investing in the
Subsidiary. The Subsidiary has entered into a separate contract with the Advisor
whereby the Advisor provides investment advisory and other services to the
Subsidiary. The Advisor does not receive separate compensation from the
Subsidiary for providing it with investment advisory and/or other services.
However, the fund pays the Advisor a fee based on the fund's assets, including
its investment in the Subsidiary.

The following information supplements the section of the above-named fund's
prospectuses titled "Understanding Distributions and Taxes"

In order to qualify for the special tax treatment accorded regulated investment
companies and their shareholders, the fund must, among other things, derive at
least 90% of its income from certain specified



                                                                     [Logo]DWS
                                                                   INVESTMENTS
                                                           Deutsche Bank Group
February 18, 2009
DCSF-3603

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sources (such income, "qualified income"). The Subsidiary will invest in
commodity-linked swaps and certain other commodity-linked derivatives. The
Internal Revenue Service (the "IRS") has issued a ruling that certain income
from commodity-linked swaps and certain other commodity-linked derivatives does
not constitute qualifying income. However, the IRS has issued letter rulings
stating that income received from a wholly-owned subsidiary investing in such
instruments would constitute qualifying income. The fund has requested that the
IRS issue a private letter ruling to the fund confirming that income derived
from the fund's investment in the Subsidiary will constitute qualifying income
to the fund. If income derived from the fund's investment in its Subsidiary
fails to constitute qualifying income, the fund may fail to qualify as a
regulated investment company.

In addition, another requirement for qualifying for the special tax treatment
accorded regulated investment companies and their shareholders is that the fund
must satisfy several diversification requirements, including the requirement
that not more than 25% of the value of the Fund's total assets may be invested
in the securities (other than those of the US Government or other regulated
investment companies) of any one issuer or of two or more issuers which the fund
controls and which are engaged in the same, similar, or related trades or
businesses. Therefore, so long as the fund is subject to this limit, the fund
may not invest any more than 25% of the value of its assets in the Subsidiary.
Absent this diversification requirement, the fund would be permitted to invest
more than 25% of the value of its assets in the Subsidiary.







               Please Retain This Supplement for Future Reference



February 18, 2009
DCSF-3603



                                       2
<PAGE>


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

DWS Commodity Securities Fund
________________________________________________________________________________

The  following  disclosure   supplements  the  fund's  Statement  of  Additional
Information.

The fund  intends to gain  exposure  to the  commodity  markets by  investing  a
portion of its assets in a wholly-owned  subsidiary  organized under the laws of
the Cayman Islands (the "Subsidiary").  Among other investments,  the Subsidiary
is expected to invest in commodity-linked derivative instruments,  such as swaps
and futures. In monitoring compliance with its investment restrictions, the Fund
will  consider  the  assets of the  Subsidiary  to be  assets  of the Fund.  The
Subsidiary  must,  however,  comply  with  the  asset  segregation  requirements
(described   elsewhere  in  the  SAI)  with  respect  to  its   investments   in
commodity-linked swaps and other commodity-linked derivatives.

The following  disclosure  replaces and  supplements  similar  disclosure  under
"Taxes" in the fund's Statement of Additional Information.

Tax   Treatment   of   Commodity-Linked   Structured   Notes.   The   status  of
commodity-linked  structured  notes  under  tests  to  qualify  as  a  regulated
investment  company under the Code is not certain.  As described above, in order
to qualify for the special tax treatment accorded regulated investment companies
and their shareholders,  the Fund must, among other things,  derive at least 90%
of its income from certain specified sources ("qualifying  income").  Qualifying
income  includes  (i)  dividends,  interest,  payments  with  respect to certain
securities  loans,  and  gains  from  the sale or other  disposition  of  stock,
securities or foreign currencies,  or other income (including but not limited to
gains from options,  futures,  or forward contracts) derived with respect to its
business of  investing in such stock,  securities,  or  currencies  and (ii) net
income deprived from interests in "qualified  publicly traded  partnerships," as
defined  above.  The Fund  has  obtained  private  letter  rulings  from the IRS
confirming   that  the  income  and  gain   arising   from   certain   types  of
commodity-linked  notes in which the Fund invests constitute "qualifying income"
under the Code. If the  commodity-linked  instruments  in which the Fund invests
are not  regarded  as  producing  qualifying  income,  then the Fund may fail to
qualify as a  regulated  investment  company.  If the Fund fails to qualify as a
regulated  investment company, the Fund will be subject to federal income tax on
its ordinary  income and capital  gains at regular  corporate  rates  (without a
deduction for  distributions to shareholders)  which will reduce net asset value
per share. When  distributed,  that income would also be taxable to shareholders
as an ordinary  dividend to the extent  attributable  to the Fund's earnings and
profits.

Tax  Treatment  of Shares of the  Subsidiary.  The IRS has issued a ruling  that
certain income from  commodity-linked  swaps and certain other  commodity-linked
derivatives does not constitute qualifying income, meaning that the Fund may not
receive  more than 10% of its  gross  income  from  direct  investments  in such
instruments.  However,  the IRS has issued  letter  rulings  stating that income
received from a  wholly-owned  subsidiary  investing in such  instruments  would
constitute  qualifying  income.  The Fund  has  requested  that the IRS  issue a
private letter ruling to the Fund concluding that income derived from the Fund's
investment in the Subsidiary will also constitute qualifying income to the Fund.
If  income  derived  from  the  Fund's  investment  in its  Subsidiary  fails to
constitute  qualifying  income,  the  Fund may fail to  qualify  as a  regulated
investment company.

In addition,  another  requirement  for qualifying for the special tax treatment
accorded regulated  investment  companies and their shareholders,  the Fund must
satisfy several diversification requirements, including the requirement that not
more than 25% of the value of the Fund's  total  assets may be  invested  in the
securities (other than those of the US Government or other regulated  investment
companies)  of any one issuer or of two or more issuers  which the Fund controls
and which are engaged in the same,  similar,  or related  trades or  businesses.
Therefore,  the Fund may not invest any more than 25% of the value of its assets
in the

<PAGE>

Subsidiary. Absent this diversification requirement, the fund would be permitted
to invest more than 25% of the value of its assets in the Subsidiary.


               Please Retain This Supplement for Future Reference


February 18, 2009