diff --git a/tests/integrations/mcs/testutil.go b/tests/integrations/mcs/testutil.go
index e4e8804ac53..da23d2fe7f2 100644
--- a/tests/integrations/mcs/testutil.go
+++ b/tests/integrations/mcs/testutil.go
@@ -34,6 +34,7 @@ import (
 
 var once sync.Once
 
+// InitLogger initializes the logger for test.
 func InitLogger(cfg *tso.Config) (err error) {
 	once.Do(func() {
 		// Setup the logger.
@@ -100,6 +101,7 @@ func StartSingleTSOTestServer(ctx context.Context, re *require.Assertions, backe
 	return s, cleanup
 }
 
+// NewTSOTestServer creates a tso server with given config for testing.
 func NewTSOTestServer(ctx context.Context, cfg *tso.Config) (*tso.Server, testutil.CleanupFunc, error) {
 	s := tso.CreateServer(ctx, cfg)
 	if err := s.Run(); err != nil {