Enhanced full text PDFs are made available through an integration with the PDF viewer from ReadCube, which is part of the Digital Science group. The PDF viewer is an enhanced PDF including hyperlinks to names of authors or in-line citations, linking out directly to the references. It also provides a one-click access to figures and supplements, as well as a reference list with links to the actual references, article metrics such as citation counts and Altmetric scores, export of citations, and much more. For more information on what the ReadCube Viewer has to offer, please go to www.readcube.com.