http2/http2-spec — pull request #665 by MikeBishop (2014-12-02 18:18:10+00:00)
Title: No PUSH_PROMISE in idle

The current text says that you can receive a PUSH_PROMISE on an idle stream, which I don't believe was ever the intent. Clarifying that PUSH_PROMISE references an idle stream in the Promised Stream ID field, and is not actually sent on the idle stream.