diff --git a/internal/querycoord/task_scheduler.go b/internal/querycoord/task_scheduler.go
index 28748eaf0f..d792649a3d 100644
--- a/internal/querycoord/task_scheduler.go
+++ b/internal/querycoord/task_scheduler.go
@@ -96,6 +96,7 @@ func (queue *TaskQueue) addTaskToFront(t task) {
 	}
 }
 
+// PopTask pops a trigger task from task list
 func (queue *TaskQueue) PopTask() task {
 	queue.Lock()
 	defer queue.Unlock()