diff --git a/draft-ietf-uta-tls13-iot-profile.md b/draft-ietf-uta-tls13-iot-profile.md
index a736e72..55979a5 100644
--- a/draft-ietf-uta-tls13-iot-profile.md
+++ b/draft-ietf-uta-tls13-iot-profile.md
@@ -595,7 +595,7 @@ Subordinate certification authorities SHOULD NOT have any extendedKeyUsage.
 ### Basic Constraints
 
 The Basic Constraints extension MUST be set, MUST be marked critical, the cA flag
-MUST be set to true.
+MUST be set to true and the pathLenConstraint SHOULD be omitted.
 
 ### CRL Distribution Point