Update draft-ietf-quic-recovery.md

draft-ietf-quic-recovery.md

@@ -1043,9 +1043,10 @@ 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.
+retransmittable to send.  This occurs when the connection is application
+limited and after a verified retransmission timeout.  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