SUPPLEMENT TO AGREEMENT BY AND BETWEEN HIGH SPEED NET SOLUTIONS, INC. AND WILLIAM DUNAVANT WHEREAS, on or about January 15, 1999, the parties entered into an oral agreement (the "Oral Agreement") for the exchange of common stock of High Speed Net...

                     SUPPLEMENT TO AGREEMENT BY AND BETWEEN
               HIGH SPEED NET SOLUTIONS, INC. AND XXXXXXX XXXXXXXX

    WHEREAS,  on or about  January 15,  1999,  the parties  entered into an oral
agreement (the "Oral  Agreement") for the exchange of common stock of High Speed
Net Solutions, Inc. for common stock of Summus Technologies, Inc.; and

    WHEREAS,  the  parties  have just now  memorialized  the Oral  Agreement  in
writing by a written  agreement  (the "Written  Agreement")  dated and effective
August 13, 1999 by and between the parties.

    NOW THEREFORE, it is agreed as follows:

1.  The actual  effective  date for the Written  Agreement  shall be January 15,
    1999.

                                        HIGH SPEED NET SOLUTIONS, INC.


/s/ Xxxxxxx X. Xxxxxxxx                 By: /s/ Xxxxxxx X. Xxxxxx
----------------------------               -------------------------------------
Xxxxxxx X. Xxxxxxxx                        Xxxxxxx Xxxxxx, Chairman of the Board