> ## Documentation Index > Fetch the complete documentation index at: https://fabric.so/llms.txt > Use this file to discover all available pages before exploring further. # Annotations > Make notes, highlights, and comments on any document or file. ## Comment, mention and leave feedback * Highlight any text and click the yellow highlight icon to create an annotation referencing that text highlight. You can optionally choose to add some text, creating a comment. * Clicking the location icon on the annotation (in the comment panel) will auto-scroll the text editor to that location. * You can also @mention a teammate or collaborator, and they'll receive a notification. *** ## What can I annotate? You can directly annotate PDFs, markdown files, Fabric notes, JSON, HTML, and .txt. *** ## What can I add a comment on? If it's a comment without a location position (i.e. just a comment about the file itself), then you can do it to anything in Fabric. Every file, note, link etc. supports adding multiple comments to it, @mentioning others etc.