diff --git a/xos/tosca/custom_types/vsm.m4 b/xos/tosca/custom_types/vsm.m4
index 4589380..f137d5c 100644
--- a/xos/tosca/custom_types/vsm.m4
+++ b/xos/tosca/custom_types/vsm.m4
@@ -15,4 +15,16 @@
         properties:
             xos_base_props
             xos_base_service_props
-
+            service_message:
+                type: string
+                required: true
+            
+    tosca.nodes.VSMTenant:
+        derived_from: tosca.nodes.Root
+        description: >
+            VSM Tenant
+        properties:
+            xos_base_tenant_props
+            tenant_message:
+                type: string
+                required: true
\ No newline at end of file
diff --git a/xos/tosca/custom_types/vsm.yaml b/xos/tosca/custom_types/vsm.yaml
index 274f1cd..21f0f67 100644
--- a/xos/tosca/custom_types/vsm.yaml
+++ b/xos/tosca/custom_types/vsm.yaml
@@ -78,4 +78,23 @@
                 type: string
                 required: false
                 description: Version number of Service.
-
+            service_message:
+                type: string
+                required: true
+            
+    tosca.nodes.VSMTenant:
+        derived_from: tosca.nodes.Root
+        description: >
+            VSM Tenant
+        properties:
+            kind:
+                type: string
+                default: generic
+                description: Kind of tenant
+            service_specific_id:
+                type: string
+                required: false
+                description: Service specific ID opaque to XOS but meaningful to service
+            tenant_message:
+                type: string
+                required: true
\ No newline at end of file