Alan Ng recently requested a feature for Canvas that’s open for global voting. The request is for instructors to be able to include a direct link while annotating feedback as we grade student work. This link could go to a specific Canvas or OER page containing relevant or clarifying information that students can simply click on to access.

If you’re interested in such a feature, or if you’d simply like to help a colleague, you can vote at the link below (please note that you’ll be prompted to log in to your Canvas account).
https://community.canvaslms.com/ideas/13334-make-links-in-speedgrader-comments-clickable