diff --git a/core/state/statedb.go b/core/state/statedb.go
index ab152dd18d..f9c1603f02 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -312,7 +312,7 @@ func (s *StateDB) GetStorageRoot(addr common.Address) common.Hash {
 	return common.Hash{}
 }
 
-// TxIndex returns the current transaction index set by Prepare.
+// TxIndex returns the current transaction index set by SetTxContext.
 func (s *StateDB) TxIndex() int {
 	return s.txIndex
 }