回複：AP application form, part 7, asking for a separate

Read the I-131 form, from the end of the page 3:

b. An explanation or other evidence showing the circumstances that warrant issuance of anadvance parole document; or
c. If you are an applicant for adjustment of status, a copy of the USCIS or former INS receipt as evidence that you filed the adjustment application;

did you see the word "or"? no need to explain anything if you're filing AP based on 485 - my understanding.