diff --git a/internal/storage/binlog_iterator.go b/internal/storage/binlog_iterator.go
index 061caaf2845c8e0fdebea7789eeb46dc4c9692b4..87ef8c01a04048f2306e63d9ded4b9f9539d8e4d 100644
--- a/internal/storage/binlog_iterator.go
+++ b/internal/storage/binlog_iterator.go
@@ -25,7 +25,7 @@ var (
 	ErrDisposed = errors.New("iterator is disposed")
 )
 
-// Iterator is the iterator interface
+// Iterator is the iterator interface.
 type Iterator interface {
 	// HasNext returns true if the iterator have unread record
 	HasNext() bool