For each link that points to a document that can be downloaded, the following information must be included in the link text:
Name of the document.
Format of the document.
Size of the document.
Note
If it is not practical to make certain link texts explicit (lack of space in the mock-up, for example), there are other solutions that can be used later in the development phase (adding tooltips, for example). Nevertheless, this is a compromise solution that is less effective than directly optimizing the link text.