diff --git a/draft-ietf-quic-recovery.md b/draft-ietf-quic-recovery.md
index f301ea0c8d..001e74d061 100644
--- a/draft-ietf-quic-recovery.md
+++ b/draft-ietf-quic-recovery.md
@@ -1664,6 +1664,10 @@ OnPacketSentCC(bytes_sent):
 Invoked from loss detection's OnAckReceived and is supplied with the
 newly acked_packets from sent_packets.
 
+In congestion avoidance, implementers that use an integer representation
+for congestion_window should be careful with division, and can use
+the alternative approach suggested in Section 2.1 of {{?RFC3465}}.
+
 ~~~
 InCongestionRecovery(sent_time):
   return sent_time <= congestion_recovery_start_time