diff --git a/CHANGES.md b/CHANGES.md
index 09054ac3..6f2fb31d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,8 +2,11 @@
 
 This document describes the relevant changes between releases of the API model.
 
-## 0.0.400 Oct 24 2024
+## 0.0.401 Oct 31 2024
+- Add settings for HCP Shared VPC to `Cluster` model
+- Add support for cluster arch to `DNS` model
 
+## 0.0.400 Oct 24 2024
 - Update `Parameters` attribute in addon_installation_type.model to the List of `AddonInstallationParameter` type.
 - Update `Parameters` attribute in addon_type.model to the  List of `AddonParameter` type.
 
diff --git a/model/clusters_mgmt/v1/aws_type.model b/model/clusters_mgmt/v1/aws_type.model
index 7e3f694d..dbf31a86 100644
--- a/model/clusters_mgmt/v1/aws_type.model
+++ b/model/clusters_mgmt/v1/aws_type.model
@@ -62,6 +62,12 @@ struct AWS {
 	// Role ARN for private hosted zone.
 	PrivateHostedZoneRoleARN String
 
+	// ID of local private hosted zone for hypershift internal communication.
+	HcpInternalCommunicationHostedZoneId String
+
+	// Role ARN for VPC Endpoint Service cross account role.
+	VpcEndpointRoleArn String
+
 	// Additional AWS Security Groups to be added to default worker (compute) machine pool.
 	AdditionalComputeSecurityGroupIds []String
 
diff --git a/model/clusters_mgmt/v1/cluster_arch_type.model b/model/clusters_mgmt/v1/cluster_arch_type.model
new file mode 100644
index 00000000..d741c69f
--- /dev/null
+++ b/model/clusters_mgmt/v1/cluster_arch_type.model
@@ -0,0 +1,24 @@
+/*
+Copyright (c) 2024 Red Hat, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Possible cluster architectures.
+enum ClusterArchitecture {
+    @json(name = "classic")
+    Classic
+
+    @json(name = "hcp")
+    Hcp
+}
diff --git a/model/clusters_mgmt/v1/dns_domain_type.model b/model/clusters_mgmt/v1/dns_domain_type.model
index eef47c65..94d4f083 100644
--- a/model/clusters_mgmt/v1/dns_domain_type.model
+++ b/model/clusters_mgmt/v1/dns_domain_type.model
@@ -27,4 +27,7 @@ class DNSDomain {
 
     // Indicates if this dns domain is user defined.
     UserDefined Boolean
+
+    // Signals which cluster architecture the domain is ready for.
+    ClusterArch ClusterArchitecture
 }