emberjs/data — pull request #2006 by Dave-Choi (2014-06-05 21:32:51+00:00)
Title: [DOC] Add note about expected JSON for ActiveModelAdapter relationships

This is covered in the recently added [example](https://github.com/emberjs/data/commit/70a1f842c47cd6827f6131c270e8bd68f74c65f0), but not explicit.