diff --git a/draft-ietf-quic-transport.md b/draft-ietf-quic-transport.md
index aa67ff1b95..1e97447ce2 100644
--- a/draft-ietf-quic-transport.md
+++ b/draft-ietf-quic-transport.md
@@ -627,10 +627,11 @@ any version negotiation that occurred (see {{version-negotiation}}).  The client
 MAY also retain any observed RTT or congestion state that it has accumulated for
 the flow, but other transport state MUST be discarded.
 
-The payload of the Retry packet contains a single STREAM frame
-on stream 0 with offset 0 containing the server's cryptographic stateless retry
-material. It MUST NOT contain any other frames. The next STREAM frame sent by
-the server will also start at stream offset 0.
+The payload of the Retry packet contains at least two frames. It MUST include a
+STREAM frame on stream 0 with offset 0 containing the server's cryptographic
+stateless retry material. It MUST also include an ACK frame to acknowledge the
+client's Initial packet. It MAY additionally include PADDING frames. The next
+STREAM frame sent by the server will also start at stream offset 0.
 
 
 ### Handshake Packet {#packet-handshake}