I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review. Document editors and WG chairs should treat these comments just like any other last call comments. Summary: This document extends OAuth 2.0 Authorization Framework defining request parameters that enable a client to explicitly signal to an authorization server : 1. In Authorization Request: the identity of the protected resource to which it is requesting access and 2. In Access Token Request: where it intends to use the access token it is requesting The document is well written and meets the Operations and Management Review Checklist - https://tools.ietf.org/html/rfc5706#appendix-A. The proposed extension does not have a significant operational impact on the network.