emberjs/ember.js — pull request #2800 by gilesbowkett (2013-06-05 22:10:40+00:00)
Title: document that 'needs' is for singleton controllers only

question raised here on discuss.emberjs.com:

http://discuss.emberjs.com/t/documentation-needs-api-is-it-only-for-singleton-controllers/911/3

surprised me, surprised other people I'm working with. useful thing to have in the docs.