
Dreyfus/The Boston Company Small Cap Value Fund
Dreyfus/The Boston Company Small Cap Value Fund
October 18, 2013 DREYFUS INVESTMENT FUNDS Dreyfus/The Boston Company Small Cap Value Fund Supplement to Summary and Statutory Prospectuses dated February 1, 2013 IMPORTANT NOTICE REGARDING CHANGE IN INVESTMENT POLICY
The following information will supersede and replace the second sentence of the first paragraph in "Principal Investment Strategy" in the summary prospectus and "Fund Summary - Principal Investment Strategy" in the prospectus and the fourth and fifth sentences of the first paragraph in "Fund Details - Goal and Approach" in the prospectus:
The fund currently considers small-cap companies to be those with total market capitalizations that are equal to or less than the total market capitalization of the largest company included in the Russell 2000^® Value Index (the “Index”), the fund’s benchmark index. As of September 30, 2013, the market capitalization of the largest company in the Index was approximately $4.32 billion. Market capitalization varies with market changes and reconstitutions of the Index.

No authoritative reference available.

No definition available.

Name:	ck0000799295_SupplementTextBlock
Namespace Prefix:	ck0000799295_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicated

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 2

+ Details

Name:	rr_RiskReturnHeading
Namespace Prefix:	rr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Principal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 4

-Subsection a

+ Details

Name:	rr_StrategyHeading
Namespace Prefix:	rr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Form

-Number N-1A

-Chapter A

-Section 4

-Subsection a

+ Details

Name:	rr_StrategyNarrativeTextBlock
Namespace Prefix:	rr_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration