Thales Alenia Space Orange University of Aberdeen University of Aberdeen Private Octopus Inc. This document describes an extension for QUIC. This enables the exchange of Congestion Control (CC) parameters related to the characteristics of the between the sender and the receiver during a connection. These CC parameters allow a receiver to prepare to use additional capacity that is made available when using Careful Resume. It can also allow a receiver to request that previously computed CC parameters, are not used when the receiver has additional information about the current path or traffic that is to be sent.