diff --git a/internal/distributed/datanode/service.go b/internal/distributed/datanode/service.go
index 26b6f7bc8a..6aa72d7a5f 100644
--- a/internal/distributed/datanode/service.go
+++ b/internal/distributed/datanode/service.go
@@ -46,6 +46,7 @@ import (
 	"google.golang.org/grpc/keepalive"
 )
 
+// Params contains parameters for datanode grpc server.
 var Params paramtable.GrpcServerConfig
 
 type Server struct {