Update draft-ietf-quic-recovery.md

draft-ietf-quic-recovery.md

@@ -1042,18 +1042,20 @@ in Linux (3.11 onwards).
 
 ## Resumption from idle
 
-A connection is idle if bytes in flight is 0 and there is nothing retransmittable
-to send.  In order to limit the size of bursts sent into the network, the
-behavior when restarting from idle depends upon whether pacing is used.
+A connection is idle if bytes in flight is 0 and there is nothing
+retransmittable to send.  In order to limit the size of bursts sent into the
+network, the behavior when restarting from idle depends upon whether pacing is
+used.
 
 If pacing is used, the connection should limit the initial burst of packets to
-no more than the initial congestion window and subsequent packets SHOULD be paced.
-The congestion window does not change while the connection is idle.
+no more than the initial congestion window and subsequent packets SHOULD be
+paced. The congestion window does not change while the connection is idle.
 
 If pacing is not used, the congestion window SHOULD be reset to the minimum of
 the current congestion window and the initial congestion window.  If the
 slow start threshold is larger than the congestion window, the congestion window
-will grow back to the congestion window prior to idle via slow start.
+will grow back to the congestion window prior to idle via slow start.  This
+recommendation is based on Section 4.1 of {{?RFC5681}}.
 
 ## Pseudocode