diff --git a/qb/batch.go b/qb/batch.go
index 4e14fec..4fa8bd5 100644
--- a/qb/batch.go
+++ b/qb/batch.go
@@ -23,6 +23,13 @@ type BatchBuilder struct {
 }
 
 // Batch returns a new BatchBuilder.
+// BatchBuilder encapsulates batch cqls as one ordinary gocql.Query for convenience.
+// Below are the limitations of encapsulating batch cqls based on gocql.Query instead of gocql.Batch:
+//    * gocql.Batch has some more batch specific check, such as BatchSize(65535).
+//    * gocql.Batch use BatchObserver instead of QueryObserver.
+//    * gocql.Batch has cancelBatch call back.
+//    * gocql.Batch prepares the included statements separately, which is more efficient.
+//      In contrast, gocqlx.qb.BatchBuilder, which is based on gocql.Query, prepares the whole batch statements as one ordinary query.
 //
 // Deprecated: Please use gocql.Session.NewBatch() instead.
 func Batch() *BatchBuilder {