diff --git a/man2/readv.2 b/man2/readv.2
index 831cf6260..880435edf 100644
--- a/man2/readv.2
+++ b/man2/readv.2
@@ -232,6 +232,25 @@ This flag is meaningful only for
 .BR pwritev2 (),
 and its effect applies only to the data range written by the system call.
 .\" commit e864f39569f4092c2b2bc72c773b6e486c7e3bd9
+.TP
+.BR RWF_NOWAIT " (since Linux 4.14)"
+Do not wait for data which is not immediately available.
+If this flag is specified the
+.BR preadv2 ()
+system call will return instantly if it would have to read data from
+the backing storage or wait for a lock.
+If some data was successfully read, it will return the number of bytes read.
+If no bytes were read, it will return -1 and set
+.IR errno
+to 
+.BR EAGAIN .
+This flag is meaningful only for
+.BR preadv2 ()
+at the moment.
+.\" commit 3239d834847627b6634a4139cf1dc58f6f137a46
+.\" commit 91f9943e1c7b6638f27312d03fe71fcc67b23571
+
+
 .SH RETURN VALUE
 On success,
 .BR readv (),