This template adds the current page (presumed to be the main page of a book) to a specified subject category, and tries to add it to the allbooks categories of that subject and all that subject's ancestors.



There are two parameters, one required and non-blank, the other optional.

  • 1 — Required. Names the subject to add the book to.
  • diagnose — Optional. If blank, error conditions result only in addition of the book to hidden Category:Attention needed (allbooks). If non-blank, diagnostic messages are also generated, with suggested remedies and buttons for effecting them.

Only addition to the named subject, Category:{{{1}}}, is done within this template; population of allbooks categories is delegated to {{Subjects/0}}.

This template is also responsible for populating Category:Books with book name as subject.