diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index b23eeca4d67729c14e95a1a2ce082922939ebfcd..794b2a33a2c36c8f4c335a9868fbccdb11d2e99a 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -235,6 +235,8 @@ enum hctx_type {
  * @flags:	   Zero or more BLK_MQ_F_* flags.
  * @driver_data:   Pointer to data owned by the block driver that created this
  *		   tag set.
+ * @active_queues_shared_sbitmap:
+ * 		   number of active request queues per tag set.
  * @__bitmap_tags: A shared tags sbitmap, used over all hctx's
  * @__breserved_tags:
  *		   A shared reserved tags sbitmap, used over all hctx's