diff --git a/draft-ietf-quic-transport.md b/draft-ietf-quic-transport.md
index a9f5041d96..17c713c749 100644
--- a/draft-ietf-quic-transport.md
+++ b/draft-ietf-quic-transport.md
@@ -2714,13 +2714,19 @@ but not the UDP or IP header.
 
 The initial client packet SHOULD be padded to exactly 1200 octets unless the
 client has a reasonable assurance that the PMTU is larger.  Sending a packet of
-this size ensures that the network path supports an MTU of this size and helps
-reduce the amplitude of amplification attacks caused by server responses toward
-an unverified client address.
+this size ensures that the network path from the client to the server supports
+an MTU of this size and helps reduce the amplitude of amplification attacks
+caused by server responses toward an unverified client address.
 
 Servers MUST ignore an initial plaintext packet from a client if its total size
 is less than 1200 octets.
 
+Similarly, servers MUST ensure that the first handshake packet they send to
+clients, and any retransmissions of those octets, has a QUIC packet size that is
+the same as the received initial client packet, unless the server knows the PMTU
+to the client to be smaller. Sending a packet of this size ensures that the
+network path from the server to the client supports an MTU of this size.
+
 If a QUIC endpoint determines that the PMTU between any pair of local and remote
 IP addresses has fallen below 1280 octets, it MUST immediately cease sending
 QUIC packets on the affected path.  This could result in termination of the