To place a user bookmark, the user must hit the “G” key to enter the bookmarking mode. Click on mouse to add bookmark and double-click to annotate with free form text. User bookmarks can be selected and deleted as well ('Delete' or 'X'). We can double click on a bookmark to change its annotation content. Bookmarks are classified into three types: Merge, Split and Other. Merge and Split bookmarks can be used to mark falsely merged bodies and falsely split bodies. Other-type bookmarks can be used to label specific bodies for proofreading assignments.