diff --git a/internal/proxy/task_scheduler.go b/internal/proxy/task_scheduler.go
index 64b65a35b8..132cbac0ff 100644
--- a/internal/proxy/task_scheduler.go
+++ b/internal/proxy/task_scheduler.go
@@ -373,6 +373,7 @@ func newDqTaskQueue(tsoAllocatorIns tsoAllocator, idAllocatorIns idAllocatorInte
 	}
 }
 
+// taskScheduler schedules the gRPC tasks.
 type taskScheduler struct {
 	ddQueue *ddTaskQueue
 	dmQueue *dmTaskQueue