In project views, draw revision clouds to indicate areas of the design that changed.
You can sketch revision clouds in all views except 3D views.
Revit enters sketch mode.
The minimum arc length for the revision cloud shape can be specified in the Arc Length option on the Sheet Issues/Revisions dialog. This setting controls the arc length for all revision clouds in the project.
By default, Revit assigns to the clouds the latest revision assigned to any view on that view’s sheet. (In the sheet properties, the Current Revision parameter identifies this revision.)