Editorial cleanup of Recovery

draft-ietf-quic-recovery.md

@@ -264,9 +264,15 @@ TCP-NCR {{?RFC4653}}, to improve QUIC's reordering resilience.
 
 QUIC implementations can use time-based loss detection to handle reordering
 based on time elapsed since the packet was sent.  This may be used either as
-a replacement for a packet reordering threshold or in addition to it.
-The RECOMMENDED time threshold, expressed as a fraction of the
-round-trip time (kTimeReorderingFraction), is 1/8.
+a replacement for a packet reordering threshold or in addition to it.  When
+a larger packet is acknowledged, if it was sent more than the threshold after
+any in flight packets, those packets are immediately declared lost.
+Otherwise, a timer is set for the the reordering threshold minus the time
+difference between the earliest in flight packet and the largest newly
+acknowledged packet.  Note that in some cases the timer could become longer
+when packets are acknowleged out of order. The RECOMMENDED time threshold,
+expressed as a fraction of the round-trip time (kTimeReorderingFraction),
+is 1/8.
 
 ### Early Retransmit