To facilitate responsible use of data from Student Evaluation of Teaching and Courses (SETC), Senate has endorsed the principle that "[SETC] data will not be used as the only source of data to evaluate teaching performance."
One way in which the SETC process applies this principle is by giving you the opportunity to submit a brief narrative to provide context and make note of any circumstances you think should be considered when your evaluation results are interpreted. This narrative is then included in reports used for summative purposes and those sent to department chairs and school directors.
To submit the narrative, watch for an email invitation during the evaluation period at the end of the semester. The email will contain a link to a form with space for your (optional) contextual narrative. Or you can just login to the system and see if a narrative task is available to you.