diff --git a/core/src/main/scala/kafka/utils/timer/Timer.scala b/core/src/main/scala/kafka/utils/timer/Timer.scala
index bdd0e75b93e4b..527f4848ab182 100644
--- a/core/src/main/scala/kafka/utils/timer/Timer.scala
+++ b/core/src/main/scala/kafka/utils/timer/Timer.scala
@@ -25,6 +25,7 @@ import kafka.utils.threadsafe
 @threadsafe
 class Timer(taskExecutor: ExecutorService, tickMs: Long = 1, wheelSize: Int = 20, startMs: Long = System.currentTimeMillis) {
 
+  //
   private[this] val delayQueue = new DelayQueue[TimerTaskList]()
   private[this] val taskCounter = new AtomicInteger(0)
   private[this] val timingWheel = new TimingWheel(