diff --git a/shardingsphere-operator/pkg/distsql/ast/read_write_splitting.go b/shardingsphere-operator/pkg/distsql/ast/read_write_splitting.go
index 97c9a848..c6151956 100644
--- a/shardingsphere-operator/pkg/distsql/ast/read_write_splitting.go
+++ b/shardingsphere-operator/pkg/distsql/ast/read_write_splitting.go
@@ -22,6 +22,7 @@ import (
 	"strings"
 )
 
+// define read write splitting ast
 type CreateReadwriteSplittingRule struct {
 	IfNotExists                         *IfNotExists
 	AllReadwriteSplittingRuleDefinition []*ReadWriteSplittingRuleDefinition