Annotate is a system which provides an annotation facility for DocBook documents. It is possible to publish any DocBook document on the web, after exporting it to HTML files. Using Annotate, visitors of the DocBook document will be able to add comments to any chapter, section or paragraph.

Annotate works by adding additional tags to the DocBook XSL stylesheets. These tags are added to the HTML output where comments can be made later. This means that it is not needed to change the source document. A CGI script replaces the tags by the actual comments on request by the visitor.