Class Comment Pane
The Class Comment Pane displays the class comment (if available) for the currently selected class. If you make changes to a comment you can commit them using Workspace/Accept or Ctrl+S.
Note that although the comment pane is normally used for entering or browsing comments, it is also a workspace so the various workspace operations can be used here too. This is useful if you wish to provide examples within the comment then readers will be able to execute any lines of Smalltalk in-situ.
The Class Comment Pane is a class browser plug-in and is implemented by the ClassCommentPlugIn class in the image.