diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ImmutableMapSerializer.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ImmutableMapSerializer.java
index 244cc57..734033f 100644
--- a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ImmutableMapSerializer.java
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ImmutableMapSerializer.java
@@ -19,6 +19,9 @@
 
     private final MapSerializer mapSerializer = new MapSerializer();
 
+    /**
+     * Creates {@link ImmutableMap} serializer instance.
+     */
     public ImmutableMapSerializer() {
         // non-null, immutable
         super(false, true);