diff --git a/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/YangToolUtil.java b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/YangToolUtil.java
index 0ec9985..b0d56cb 100644
--- a/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/YangToolUtil.java
+++ b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/YangToolUtil.java
@@ -294,6 +294,7 @@
      * @return DataNode
      */
     public static DataNode toDataNode(ModelObject input) {
+        // FIXME this converter will work with root-level nodes only.
         initStaticContext();
         ModelObjectData modelData = DefaultModelObjectData.builder()
                 .addModelObject(input)