Form 497 DREYFUS THIRD CENTURY

Current Fundamental Policy

Proposed Fundamental Policy or Change

The fund may not…

The fund may not…

3.  Commodities

See 10 below.

Invest in physical commodities or physical commodities contracts, except that the fund may purchase and sell commodity-linked or index-linked structured notes, commodity-related ETFs or ETNs, options, forward contracts, futures contracts, including those related to indices, and options on futures contracts or indices and enter into swap agreements and other derivative instruments.

4.  Issuer Diversification

Purchase the securities of any issuer if such purchase would cause more than 5% of the value of its total assets to be invested in securities of such issuer (except securities of the U.S. Government or any instrumentality thereof).

With respect to 75% of its total assets, purchase securities of an issuer (other than the U.S. Government, its agencies, instrumentalities or authorities or repurchase agreements collateralized by U.S. Government securities and other investment companies), if: (a) such purchase would  cause more than 5% of the fund's total assets taken at market value to be invested in the securities of such issuer; or (b) such purchase would at the time result in more than 10% of the outstanding voting securities of such issuer being held by the fund.

5.  Industry Concentration

Concentrate its investments in any particular industry or industries, except that the fund may invest up to 25% of the value of its total assets in a single industry.

Invest more than 25% of the value of its total assets in the securities of issuers in any single industry, provided that there shall be no limitation on the purchase of obligations issued or guaranteed by the U.S. Government, its agencies or instrumentalities or as otherwise permitted by the SEC.  Securities issued or guaranteed by governments other than the U.S. Government or by foreign supranational entities are not considered to be the securities of issuers in a single industry for purposes of this Fundamental Policy.

7.  Short Sales; Margin

Purchase securities on margin, but the fund may obtain such short-term credit as may be necessary for the clearance of purchases and sales of securities.

See 12 below.

Change to Nonfundamental Policy:

Purchase securities on margin, except for use of short-term credit necessary for clearance of purchases and sales of portfolio securities, but the fund may make margin deposits in connection with transactions in options, forward contracts, futures contracts, options on futures contracts, swap agreements and other derivative instruments, and except that effecting short sales will be deemed not to constitute a margin purchase for purposes of this Nonfundamental Policy.

10.  Real Estate; Oil and Gas

Purchase, hold or deal in commodities or commodity contracts, in oil, gas, or other mineral exploration or development programs, or in real estate but this shall not prohibit the fund from investing, consistent with Nonfundamental Policy No. 5 below [Illiquid Investments], in securities of companies engaged in oil, gas or mineral investments or activities.  This limitation shall not prevent the fund from investing in securities issued by a REIT, provided that such trust is not permitted to invest in real estate or in interests other than mortgages or other security interests.

Purchase, hold or deal in oil, gas, or other mineral exploration or development programs, or in real estate, but this shall not prohibit the fund from investing in securities of companies engaged in oil, gas or mineral investments or activities and securities that are secured by real estate or issued by companies that invest or deal in real estate or REITs and acquiring and holding real estate or interests therein through exercising rights or remedies with regard to such securities.

11.  Senior Securities

None.

Issue any senior security, except to the extent permitted under the 1940 Act.

12.  Short Sales

Sell any security short or engage in the purchase and sale of put, call, straddle, or spread options or combinations thereof, or in writing such options, except that the fund may write and sell covered call option contracts on securities owned by the fund up to, but not in excess of, 20% of the market value of its net assets at the time such option contracts are written.  The fund may also purchase call options for the purpose of terminating its outstanding obligations with respect to securities upon which covered call option contracts have been written.  In connection with the writing of covered call options, the fund may pledge assets to an extent not greater than 20% of the market value of its total net assets at the time such options are written.

Remove Fundamental Policy.

13.  Underwriting

Act as an underwriter of securities of other issuers.

Act as an underwriter of securities of other issuers, except to the extent the fund may be deemed an underwriter under the Securities Act in connection with the purchase and sale of portfolio securities.

14.  Investing for Control

Invest in the securities of a company for the purpose of exercising management or control, but the fund will vote the securities it owns in its portfolio as a shareholder in accordance with its views.

Change to Nonfundamental Policy.

16.  Other

The fund's special considerations described in the prospectus.

Purchase securities of any company having less than three years' continuous operating history (including that of any predecessors) if such purchase would cause the value of the fund's investments in all such securities to exceed 5% of the value of its net assets.

Purchase or retain the securities of any issuer if officers or board members of the fund or of the Manager, who own beneficially more than 1/2 of 1% of the securities of such issuer, together own beneficially more than 5% of the securities of such issuer.

Purchase from or sell to any of its officers or board members, or firms of which any of them are members, any securities (other than capital stock of the fund), but such persons or firms may act as brokers for the fund for customary commissions.

Purchase warrants in excess of 2% of the value of its net assets.  Such warrants shall be valued at fair market value, except that warrants acquired by the fund in units or attached to securities shall be deemed to be without value, for purposes of this restriction only.

Remove Fundamental Policies.

Current Nonfundamental Policy

Proposed Nonfundamental Policy

The fund may not…

The fund may not…

3.  Pledging Assets

Pledge, mortgage, hypothecate or otherwise encumber its assets, except to the extent necessary to secure permitted borrowings.

Pledge, mortgage or hypothecate its assets, except to the extent necessary to secure permitted borrowings and to the extent related to effecting short sales of securities, the purchase of securities on a when-issued, forward commitment or delayed-delivery basis and the deposit of assets in escrow in connection with the entry into options, forward contracts, futures contracts, options on futures contracts, swap agreements and other derivative instruments.

Fund

Investment Objective(s) a Fundamental or Nonfundamental Policy

Classification as Diversified or Non-Diversified

The Dreyfus Sustainable U.S. Equity Fund, Inc.

Nonfundamental

Diversified

Fund

80% Test

Fundamental Policy?

The Dreyfus Sustainable U.S. Equity Fund, Inc.

Equity securities (or derivatives or other strategic instruments with similar economic characteristics) of U.S. companies.

No