diff --git a/triedb/pathdb/journal.go b/triedb/pathdb/journal.go
index 027c36bdb..2b92d4f39 100644
--- a/triedb/pathdb/journal.go
+++ b/triedb/pathdb/journal.go
@@ -354,6 +354,7 @@ func (db *Database) loadDiskLayer(r *rlp.Stream, journalTypeForReader JournalTyp
 			return nil, fmt.Errorf("failed to load disk nodes: %v", err)
 		}
 		nodes = make(map[common.Hash]map[string]*trienode.Node)
+		// todo: use flatten function
 		for _, entry := range encoded {
 			subset := make(map[string]*trienode.Node)
 			for _, n := range entry.Nodes {
diff --git a/triedb/pathdb/nodebufferlist.go b/triedb/pathdb/nodebufferlist.go
index 77302914c..7920662bc 100644
--- a/triedb/pathdb/nodebufferlist.go
+++ b/triedb/pathdb/nodebufferlist.go
@@ -594,6 +594,11 @@ func (nf *nodebufferlist) getMultiLayerNodes() []nblJournalData {
 		return true
 	}
 	nf.traverseReverse(merge)
+
+	for i, val := range nodesArray {
+		log.Info("print multi layers node info", "index", i, "root", val.root, "layers", val.layers,
+			"size", val.size)
+	}
 	return nodesArray
 }