Update draft-ietf-quic-recovery.md

draft-ietf-quic-recovery.md

@@ -747,7 +747,8 @@ creates a packet burst that might cause short-term congestion and losses.
 Implementations MUST either use pacing or limit such bursts to the initial
 congestion window, which is recommended to be the minimum of
 10 * max_datagram_size and max(2* max_datagram_size, 14720)), where
-max_datagram_size is the current maximum size of a datagram for the connection.
+max_datagram_size is the current maximum size of a datagram for the connection,
+not including UDP or IP overhead.
 
 As an example of a well-known and publicly available implementation of a flow
 pacer, implementers are referred to the Fair Queue packet scheduler (fq qdisc)