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diff --git a/federation/synchron/block_processor.go b/federation/synchron/block_processor.go
index c07e69e..1e51ff3 100644 (file)
--- a/federation/synchron/block_processor.go
+++ b/federation/synchron/block_processor.go
@@ -181,6 +181,7 @@ func getCrossChainInputs(ormTxID uint64, tx *btmTypes.Tx) []*orm.CrossTransactio
                        continue
                }
 
+               // default null SidechainTxID, which will be set after submitting cross_in tx on sidechain
                input := &orm.CrossTransactionInput{
                        MainchainTxID: ormTxID,
                        SourcePos:     uint64(i),