Update draft-ietf-quic-recovery.md

draft-ietf-quic-recovery.md

@@ -520,11 +520,12 @@ A sender recomputes and may need to reset its PTO timer every time an
 ack-eliciting packet is sent or acknowledged, when the handshake is confirmed,
 or when Initial or Handshake keys are discarded. This ensures the PTO is always
 set based on the latest RTT information and for the last sent ack-eliciting
-packet in the correct packet number space.  A client could have received and
-acknowledged a Handshake packet, causing it to discard state for the Initial
-packet number space, but not sent any ack-eliciting Handshake packets.
-In this case, there are no ack-eliciting packets, so the PTO is set
-from the current time.
+packet in the correct packet number space. When the PTO is armed and there are
+no ack-eliciting packets in flight, the PTO is set from the current time.
+This occurs if a client's Initial packets are acknowledged or a client has
+received and acknowledged a Handshake packet, causing it to discard state for
+the Initial packet number space, but not sent any ack-eliciting Handshake
+packets.
 
 When ack-eliciting packets in multiple packet number spaces are in flight,
 the timer MUST be set for the packet number space with the earliest timeout,