An electronic document and associated system, methods and apparatus is described. The electronic document is loaded in a user device configured to communicate with an external device that generates instructions for augmenting content contained in the electronic document with links to contextually relevant information. The content can be augmented with one or more user interface elements, and the augmented content can be displayed with one or more attributes which can be selected by a document author. The document author can mark or otherwise designate one or more portions of the electronic document to be excluded from the augmenting process.