diff --git a/fs/io_uring.c b/fs/io_uring.c
index 4bde5da2c2f55068d39b2dc9a3dd77231b05254d..a700ee5fc89d61d995c8387b366fdfbbc7714ae3 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4629,6 +4629,13 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 	if (*link) {
 		struct io_kiocb *head = *link;
 
+		/*
+		 * Taking sequential execution of a link, draining both sides
+		 * of the link also fullfils IOSQE_IO_DRAIN semantics for all
+		 * requests in the link. So, it drains the head and the
+		 * next after the link request. The last one is done via
+		 * drain_next flag to persist the effect across calls.
+		 */
 		if (sqe_flags & IOSQE_IO_DRAIN) {
 			head->flags |= REQ_F_IO_DRAIN;
 			ctx->drain_next = 1;