rewrite based on feedback

draft-ietf-quic-transport.md

@@ -3804,13 +3804,12 @@ number length, connection ID length, and path MTU.  A receiver MUST accept
 packets containing an outdated frame, such as a MAX_DATA frame carrying a
 smaller maximum data than one found in an older packet.
 
-When a sender declares a packet as lost and either retransmits the contained
-frames or marks them for retransmission, the sender SHOULD avoid subsequent
-retransmission of this information if it later receives an acknowledgement for
-that packet. Doing so requires senders to retain information about packets after
-they are declared lost. A sender can discard this information after a period of
-time elapses, such as three times the PTO (Section 6.2 of {{QUIC-RECOVERY}}), or
-on other events, such as reaching a memory limit.
+A sender SHOULD avoid retransmitting information from packets that are
+acknowledged, including those that are acknowledged after they are declared
+lost. Doing so requires senders to retain information about packets after they
+are declared lost. A sender can discard this information after a period of time
+elapses, such as three times the PTO (Section 6.2 of {{QUIC-RECOVERY}}), or on
+other events, such as reaching a memory limit.
 
 Upon detecting losses, a sender MUST take appropriate congestion control action.
 The details of loss detection and congestion control are described in