All reports of doc-base-file-no-index for the archive. The extended description of this tag is:
Format sections in doc-base control files for HTML or Info documents must contain an Index field specifying the starting document for the documentation. Even if the documentation is a single file, this field must be present.
Refer to Debian doc-base Manual section 188.8.131.52 (Format sections) for details.
This tag has not been emitted in any package tested by Lintian.