diff --git a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/PartitionedDatabase.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/PartitionedDatabase.java
index aa2d753..cdc904b 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/PartitionedDatabase.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/PartitionedDatabase.java
@@ -367,14 +367,16 @@
 
     @Override
     public boolean hasChangeNotificationSupport() {
-        return false;
+        return true;
     }
 
     @Override
     public void registerConsumer(Consumer<StateMachineUpdate> consumer) {
+        partitions.forEach(p -> p.registerConsumer(consumer));
     }
 
     @Override
     public void unregisterConsumer(Consumer<StateMachineUpdate> consumer) {
+        partitions.forEach(p -> p.unregisterConsumer(consumer));
     }
 }
diff --git a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/StateMachineUpdate.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/StateMachineUpdate.java
index a17f317..1e2a09e 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/StateMachineUpdate.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/StateMachineUpdate.java
@@ -1,5 +1,22 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.
+ */
 package org.onosproject.store.consistent.impl;
 
+import static com.google.common.base.MoreObjects.toStringHelper;
+
 /**
  * Representation of a state machine update.
  */
@@ -48,4 +65,13 @@
     public <T> T output() {
         return (T) output;
     }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this)
+                .add("name", operationName)
+                .add("input", input)
+                .add("output", output)
+                .toString();
+    }
 }
\ No newline at end of file