Most lines will consist of an article header name, optionally followed by a colon. A trailing set of lines can have the word ``full'' appear after the colon; this indicates that the header should appear as well as its value.
If this file is changed, new overview records will be constructed with the modified format. If it is desired to update existing records, it is necessary to rebuild the existing overview database using makehistory(8) after removing all existing overview files.
``Xref:full'' must be included, or innd(8) and other programs which utilize overview method cannot start.
The default file, show below, is compatible with Geoff Collyer's ``nov'' package:
Subject: From: Date: Message-ID: References: Bytes: Lines: Xref:full
Usually the only modifications which should be made to the default file are additions of new fields to the end of the file; all such fields should have ``full'' after the colon. The first eight fields should remain in the same order as above.