diff --git a/io_uring/io-wq.h b/io_uring/io-wq.h
index ba6eee76d028f64ff932c94b1de3976994d14227..3f54ee2a8eebd32a3f70636fc42720fea33a91be 100644
--- a/io_uring/io-wq.h
+++ b/io_uring/io-wq.h
@@ -155,6 +155,7 @@ struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
 struct io_wq_work {
 	struct io_wq_work_node list;
 	unsigned flags;
+	/* place it here instead of io_kiocb as it fills padding and saves 4B */
 	int cancel_seq;
 };