diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index e4bccbc..4fc379d 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -80,6 +80,7 @@
  * @get_softirq_time:	function to retrieve the current time from the softirq
  * @curr_timer:		the timer which is executing a callback right now
  * @softirq_time:	the time when running the hrtimer queue in the softirq
+ * @lock_key:		the lock_class_key for use with lockdep
  */
 struct hrtimer_base {
 	clockid_t		index;