Add some comments and a TODO
Add some comments and a TODO

Test Plan: none

Auditors: joel

iamchenxin/perseus,alexristich/perseus,abe4mvp/perseus,ariabuckles/perseus,junyiacademy/perseus,daukantas/perseus,learningequality/perseus,abe4mvp/perseus,iamchenxin/perseus,alexristich/perseus,sachgits/perseus,huangins/perseus,ariabuckles/perseus,chirilo/perseus,learningequality/perseus,ariabuckles/perseus,ariabuckles/perseus,sachgits/perseus,junyiacademy/perseus,huangins/perseus,daukantas/perseus,chirilo/perseus