Silk Central provides a complete history of all changes that are made to requirements. History information is read-only, and cannot be edited or permanently deleted.
The 
               		Recent Changes filter, which you can access by clicking 
               		 on the toolbar, enables you to efficiently view and acknowledge the latest changes and additions that have been made to requirements.
 on the toolbar, enables you to efficiently view and acknowledge the latest changes and additions that have been made to requirements.