diff --git a/draft-ietf-quic-recovery.md b/draft-ietf-quic-recovery.md
index 14853e8d7e..41056e9915 100644
--- a/draft-ietf-quic-recovery.md
+++ b/draft-ietf-quic-recovery.md
@@ -1209,6 +1209,28 @@ characteristics or application behavior.  Endpoints can use PADDING frames or
 bundle acknowledgments with other frames to reduce leaked information.
 
 
+## Misreporting ECN Markings
+
+An endpoint can misreport ECN markings to alter the congestion response of a
+peer.  Suppressing reports of ECN-CE markings could cause a peer to increase
+their send rate.  This increase could result in congestion and loss.
+
+An endpoint MAY attempt to detect suppression of reports by marking occasional
+packets that they send with ECN-CE.  If a packet marked with ECN-CE is not
+reported as having been marked when the packet is acknowledged, the endpoint
+SHOULD then disable ECN for that path.
+
+Reporting additional ECN-CE markings will cause a peer to reduce their sending
+rate, which is similar in effect to advertising reduced connection flow control
+limits and so no advantage is gained by doing so.
+
+Endpoints choose the congestion controller that they use.  Though congestion
+controllers generally treat reports of ECN-CE markings as equivalent to loss
+[RFC8311], the exact response for each controller could be different.  Failure
+to correctly respond to information about ECN markings is therefore difficult to
+detect.
+
+
 # IANA Considerations
 
 This document has no IANA actions.  Yet.