Maintaining Rev History in Drawings

Using Windchill 10.0 and Creo Elements/wf5.

Would like to keep revision history in drawings which would include letter/number followed by a brief description of change. Current models have a parameter for REV and REV_DESCRIPTION. Looking for what others are doing and what is consensus on best practice/prodedure for having rev table in drawing automatically update with new rev and description and also keep previous rev and descriptions?

Thanks.