Add code comment referencing ENG-1011

Summary:
Didn't have time to look into this now, but created a task.

I want to reference the task in a code comment so somebody in the future will know to look it up.

Test Plan: N/A

Reviewers: atul, palys-swm

Reviewed By: atul

Subscribers: Adrian, karol-bisztyga, benschac, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3754