Assembling customized documentation includes storing annotations to an original version of a document and receiving a new version of the document, wherein the new version of the document is different than the original version of the document. The assembling further includes storing an updated version of the document based on differences between the original version and the new version of the document; and associating the annotations with the updated version of the document, wherein the associated annotations and the updated version of the document form a personalized version of the document.