Setup As an admin create a user "teacher1" As an admin create a student "student1" As an admin create a course As an admin enrol teacher1 in the course with the teacher role As an admin enrol student1 in the course with the student role Testing scenario Login as teacher1 Setup your editor (Preferences > Editor preferences > Text editor > Plain Text Area) Create a quiz in the course. Add an essay question. Complete the mandatory fields. Fill in "Grader Information > Information for graders" with the following text, selecting "Markdown format": Testing the format: [A link to Moodle.org](http://moodle.org) Save the changes Login as student1 Submit and finish the quiz Login as teacher1 Go to the quiz Click the "Review attempt" for the student1 attempt Follow the "Mark comment or override mark" link Check that above the "Comment" field you're able to click the "A link to Moodle.org" link.