diff --git a/draft-ymbk-idr-l3-discovery.xml b/draft-ymbk-idr-l3-discovery.xml
index 14fe364..0d499cf 100644
--- a/draft-ymbk-idr-l3-discovery.xml
+++ b/draft-ymbk-idr-l3-discovery.xml
@@ -500,6 +500,10 @@ Flags (bit):
TLS/TCP service, and responses MUST be unicast TLS/TCP client
session open requests to it using the same AFI.
+ By default, GTSM, , SHOULD be enabled to
+ test that a received HELLO MUST be on the local link. It MAY be
+ disabled by configuration.
+
If more than one device responds, one adjacency is formed for
each unique source IP address. L3ND treats each adjacency as a
separate logical link.
@@ -533,6 +537,10 @@ Flags (bit):
would have compatible parameters on all devices, any disagreement
over TLS/TCP or trust anchors MUST be logged.
+ By default, GTSM, , SHOULD be enabled to
+ ensure that a SYN received in response to a HELLO is on the local
+ link. It MAY be disabled by configuration.
+
If the receiver of a HELLO agrees with the sender's choice of
TLS/TCP and authentication, both sides have agreed on an AFI for the
transport and on each other's IP address in that AFI. This is
@@ -1329,6 +1337,7 @@ Flags (bit):
+