diff --git a/fs/io_uring.c b/fs/io_uring.c
index 58a204cb5337fe0d3b6c4bce7f8405269f3d7e02..14ca1fadd7b53a45a1439ef9ce082cb2cefe0b8a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4571,6 +4571,13 @@ 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;