diff --git a/apps/yms/api/src/main/java/org/onosproject/yms/ypm/package-info.java b/apps/yms/api/src/main/java/org/onosproject/yms/ypm/package-info.java
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--- /dev/null
+++ b/apps/yms/api/src/main/java/org/onosproject/yms/ypm/package-info.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2016-present 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.
+ */
+
+/**
+ * Provides interfaces to YANG protocol metadata manager. YPM maintains protocol specific information
+ * (like timestamp, entity tag, etc.) for YANG modeled data.
+ */
+package org.onosproject.yms.ypm;