With this prompt, Wharton is acknowledging that some candidates have aspects of their profiles that might need a little clarification. This essay is therefore your opportunity—if needed—to address any lingering questions that an admissions officer might have about your candidacy, such as a low GRE or GMAT score, a legal or disciplinary incident, or, of course, one of the extenuating circumstances the school suggests. However, keep in mind that by submitting an optional essay, you are requiring the already overtaxed admissions readers to do additional work on your application, so do not rush to fill this space just because you fear that not doing so will somehow count against you (it will not), and also avoid being overly verbose or sharing more information than is truly necessary just because you technically can. You must ensure that the admissions committee’s extra time and effort are truly warranted.