How to change the meeting minutes character limit

Hello, We are using the minutes linked to the meetings, but we need our minutes to accept more than 4000 characters. Does anyone know if it is possible to change this meeting minutes character limit ? And if the answer is "yes", how to proceed ? (Can we change it directly in the wt.meeting.MeetingCenterMeetingInfo object (UpperLimit=4000)?) Thanks a lot in advance.