EXHIBIT 3.1

CERTIFICATE OF AMENDMENT

OF THE

CERTIFICATE OF LIMITED PARTNERSHIP

OF

BRISTOL ENERGY FUND L.P.

Under Section 121-202 of the Revised Limited Partnership Act

The undersigned, desiring to amend the Certificate of Limited Partnership of Bristol Energy Fund L.P. pursuant to the provisions of Section 121-202 of the Revised Limited Partnership Act of the State of New York, does hereby certify as follows:

FIRST:                      The name of the limited partnership is Bristol Energy Fund L.P.

The name under which the limited partnership was formed is Smith Barney Bristol Energy Fund L.P.

SECOND: The date of filing of the Certificate of Limited Partnership is April 20, 2005.

THIRD:                      By this Certificate of Amendment, the Certificate of Limited Partnership of the limited partnership is hereby amended to change the name and term of the limited partnership.

The Certificate of Limited Partnership of the limited partnership is hereby amended in the following respects:

Paragraph 1 of the Certificate of Limited Partnership, which sets forth the name of the limited partnership, is hereby amended to read as follows:

“1.           The name of the limited partnership is as follows:

Managed Futures Premier Aventis II L.P.”

Paragraph 6 of the Certificate of Limited Partnership, which sets forth the term of the limited partnership, is hereby amended to read as follows:

“6.           The latest date upon which the limited partnership is to dissolve is:

December 31, 2055”

[THE REMAINDER OF THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.]

IN WITNESS WHEREOF, the undersigned has executed this Amendment to the Certificate of Limited Partnership on this 28th day of January, 2013.

By:           Ceres Managed Futures LLC,

General Partner

By:            /s/ Walter Davis                                           

Walter Davis

Authorized Person