diff --git a/block/blk-core.c b/block/blk-core.c
index dc1fa454ae30..4bfc0d504b2d 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -850,6 +850,12 @@ int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags)
 	    !test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
 		return 0;
 
+	/*
+	 * As the requests that require a zone lock are not plugged in the
+	 * first place, directly accessing the plug instead of using
+	 * blk_mq_plug() should not have any consequences during flushing for
+	 * zoned devices.
+	 */
 	blk_flush_plug(current->plug, false);
 
 	if (bio_queue_enter(bio))
diff --git a/block/blk-mq.c b/block/blk-mq.c
index b2b318df4f69..9dd3ec42613f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1215,6 +1215,12 @@ void blk_execute_rq_nowait(struct request *rq, bool at_head)
 	WARN_ON(!blk_rq_is_passthrough(rq));
 
 	blk_account_io_start(rq);
+
+	/*
+	 * As plugging can be enabled for passthrough requests on a zoned
+	 * device, directly accessing the plug instead of using blk_mq_plug()
+	 * should not have any consequences.
+	 */
 	if (current->plug)
 		blk_add_rq_to_plug(current->plug, rq);
 	else