diff --git a/xos/tosca/custom_types/xos.yaml b/xos/tosca/custom_types/xos.yaml
index b1f6873..fbc8010 100644
--- a/xos/tosca/custom_types/xos.yaml
+++ b/xos/tosca/custom_types/xos.yaml
@@ -3,17 +3,22 @@
 node_types:
     tosca.nodes.Service:
         derived_from: tosca.nodes.Root
+        capabilities:
+            scalable:
+                type tosca.capabilities.Scalable
+#        properties:
+#            persistent:
+#                type: boolean
+#                required: false
+#                default: false
+#                description: prevent this resource from being deleted
 
     tosca.nodes.Site:
         derived_from: tosca.nodes.Root
 
     tosca.nodes.Slice:
         derived_from: tosca.nodes.Root
-        properties:
-#            site:
-#                type: string
-#                required: true
-        
+
     tosca.relationships.MemberOfSlice:
         derived_from: tosca.relationships.Root