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.

The document defines the extensions required for the Path Computation Element Protocol (PCEP) required for the deployment of stateful PCEs to support point-to-multipoint (P2MP) TE Label Switched Paths (LSPs), detailing the message and object formats used.

It is well-written with a good structure.  While not a subject matter expert, I found the document to flow very well, and the use of examples is appreciated.  Including a Manageability section in addition to the usual Security section is also helpful.