Update draft-ietf-quic-recovery.md

draft-ietf-quic-recovery.md

@@ -248,10 +248,9 @@ prior to a dramatic decrease in congestion window; see
 ### The Minimum Congestion Window is 2 Packets
 
 QUIC recommends that the minimum congestion window be 2 packets instead 
-of the 1 packet minimum in TCP.
-2 packets avoid waiting for a delayed acknowledgement and allow the PTO to
-send 2 packets instead of 1, which can be particularly important during the
-handshake.
+of the 1 packet minimum in TCP. A minimum of 2 packets avoids waiting for a
+delayed acknowledgement, which can substantially decrease throughput,
+particularly if the max_ack_delay is larger than the round trip time.
 
 
 # Estimating the Round-Trip Time {#compute-rtt}