Clean/Update some comments

Part of ONOS-1925

Change-Id: If507b7728a1f7e91c7697d9082cdc84b6c1fb8ee
diff --git a/src/main/java/net/onrc/onos/core/topology/TopologyBatchTarget.java b/src/main/java/net/onrc/onos/core/topology/TopologyBatchTarget.java
index 76adef9..7102a65 100644
--- a/src/main/java/net/onrc/onos/core/topology/TopologyBatchTarget.java
+++ b/src/main/java/net/onrc/onos/core/topology/TopologyBatchTarget.java
@@ -2,6 +2,8 @@
 
 import net.onrc.onos.api.batchoperation.BatchOperationTarget;
 
+// Note: We may not need this if we decide to use TopologyEvent as base class
+// for all the TopologyBatchOperation targets.
 /**
  * Tag interface for TopologyBatchOperation targets.
  */