Assembly: Microsoft.Office.Interop.Word (in microsoft.office.interop.word.dll)
The Add method isn't available for the Revisions collection. Revision objects are added when change tracking is enabled. Set the TrackRevisions property to True to track revisions made to the document text.
Use Revisions(index), where index is the index number, to return a single Revision object. The index number represents the position of the revision in the range or document.
The Count property for this collection in a document returns the number of items in the main story only. To count items in other stories use the collection with the Range object.