What is other additional documentation?

This is what it says on the UC Irvine website for freshman applicants who want to appeal:
Freshmen Selection Appeals: Submit the following items in ONE package postmarked by April 15 and include student name and Application ID number on each sheet of materials submitted:

  1. Appeal Cover Sheet (download and print: MS Word or PDF)
  2. Letter of appeal clearly stating new and compelling information for appeal consideration, written and signed by the applicant
  3. High school transcript from most recent term; please note the transcript must have course information and grades from fall semester of your senior year and any additional semesters available at the time of appeal; an official transcript in the school’s sealed envelope is preferred
  4. Other additional documentation
  5. Letters of recommendation are NOT REQUIRED unless requested by our staff to support appeal information

I am wondering what can qualify as number 4, other additional documentation. Thanks!

Health records such as MD appointments etc… if you appealing based on some medical issues or mental health issues that may have affected your grades could be an example of additional documentation. Basically, any documents that support your reason for the appeal besides the items mentioned in 2 and 3.