diff --git a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java
index 97bb54a..c929e56 100644
--- a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java
+++ b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java
@@ -134,6 +134,7 @@
                     }
                     tupleBuilder.reset();
                     tupleBuilder.addField(kmer.getBytes(), kmer.getOffset(), kmer.getLength());
+                    tupleBuilder.addField(node, instance)
                     tupleBuilder.addField(node.getFFList().getByteArray(), node.getFFList().getStartOffset(), node.getFFList().getLength());
                     tupleBuilder.addField(node.getFRList().getByteArray(), node.getFRList().getStartOffset(), node.getFRList().getLength());
                     tupleBuilder.addField(node.getRFList().getByteArray(), node.getRFList().getStartOffset(), node.getRFList().getLength());