COLUMBIA MID CAP GROWTH FUND
                                  (the "Fund")



                Supplement to Prospectuses Dated January 1, 2005

The section entitled "Managing the Fund - Portfolio Manager" is replaced in
entirety with the following:

PORTFOLIO MANAGER

Mr. Kenneth A. Korngiebel, CFA, a Senior Vice President of Columbia Management
manages the Fund and is responsible for implementing and maintaining the
investment themes and strategies of the Fund. Mr. Korngiebel joined Columbia in
1996 and has managed the Fund since June 2004.




                                                                   May 20, 2005