diff --git a/envoy/api/v2/discovery.proto b/envoy/api/v2/discovery.proto
index 386c37d8..dd921874 100644
--- a/envoy/api/v2/discovery.proto
+++ b/envoy/api/v2/discovery.proto
@@ -217,7 +217,6 @@ message Resource {
   // The resource's name, to distinguish it from others of the same type of resource.
   string name = 3;
 
-  // [#not-implemented-hide:]
   // The aliases are a list of other names that this resource can go by.
   repeated string aliases = 4;
 
diff --git a/envoy/api/v2/rds.proto b/envoy/api/v2/rds.proto
index ff7cb323..b114aaf2 100644
--- a/envoy/api/v2/rds.proto
+++ b/envoy/api/v2/rds.proto
@@ -71,7 +71,6 @@ message RouteConfiguration {
   // on-demand discovery of virtual hosts. The contents of these two fields will be merged to
   // generate a routing table for a given RouteConfiguration, with *vhds* derived configuration
   // taking precedence.
-  // [#not-implemented-hide:]
   Vhds vhds = 9;
 
   // Optionally specifies a list of HTTP headers that the connection manager
@@ -134,7 +133,6 @@ message RouteConfiguration {
   google.protobuf.BoolValue validate_clusters = 7;
 }
 
-// [#not-implemented-hide:]
 message Vhds {
   // Configuration source specifier for VHDS.
   core.ConfigSource config_source = 1 [(validate.rules).message = {required: true}];
diff --git a/envoy/api/v3alpha/discovery.proto b/envoy/api/v3alpha/discovery.proto
index 38a357c4..9781fa36 100644
--- a/envoy/api/v3alpha/discovery.proto
+++ b/envoy/api/v3alpha/discovery.proto
@@ -231,7 +231,6 @@ message Resource {
   // The resource's name, to distinguish it from others of the same type of resource.
   string name = 3;
 
-  // [#not-implemented-hide:]
   // The aliases are a list of other names that this resource can go by.
   repeated string aliases = 4;
 
diff --git a/envoy/api/v3alpha/rds.proto b/envoy/api/v3alpha/rds.proto
index 378f0316..3df63feb 100644
--- a/envoy/api/v3alpha/rds.proto
+++ b/envoy/api/v3alpha/rds.proto
@@ -76,7 +76,6 @@ message RouteConfiguration {
   // on-demand discovery of virtual hosts. The contents of these two fields will be merged to
   // generate a routing table for a given RouteConfiguration, with *vhds* derived configuration
   // taking precedence.
-  // [#not-implemented-hide:]
   Vhds vhds = 9;
 
   // Optionally specifies a list of HTTP headers that the connection manager
@@ -139,7 +138,6 @@ message RouteConfiguration {
   google.protobuf.BoolValue validate_clusters = 7;
 }
 
-// [#not-implemented-hide:]
 message Vhds {
   option (udpa.annotations.versioning).previous_message_type = "envoy.api.v2.Vhds";
 
diff --git a/xds_protocol.rst b/xds_protocol.rst
index 503bbbac..d7c076c2 100644
--- a/xds_protocol.rst
+++ b/xds_protocol.rst
@@ -656,6 +656,8 @@ resource of a :ref:`DeltaDiscoveryResponse <envoy_api_msg_DeltaDiscoveryResponse
 returned in the name field in the resource of a
 :ref:`DeltaDiscoveryResponse <envoy_api_msg_DeltaDiscoveryResponse>`.
 
+.. _xds_protocol_delta_subscribe:
+
 Subscribing to Resources
 ^^^^^^^^^^^^^^^^^^^^^^^^