diff --git a/qdb/qdb.go b/qdb/qdb.go
index 41fd96c65..64fdeb196 100644
--- a/qdb/qdb.go
+++ b/qdb/qdb.go
@@ -114,6 +114,8 @@ const (
 	DataCopied = TxStatus("data_copied")
 )
 
+// DataTransferTransaction contains information about data transfer
+// from one shard to another
 type DataTransferTransaction struct {
 	ToShardId   string   `json:"to_shard"`
 	FromShardId string   `json:"from_shard"`