in the most concise way i managed to come up with;
suggested by martijn@ and OK millert@ martijn@
-.\" $OpenBSD: editline.3,v 1.47 2021/08/12 10:31:15 schwarze Exp $
+.\" $OpenBSD: editline.3,v 1.48 2021/08/14 11:30:12 schwarze Exp $
.\" $NetBSD: editline.3,v 1.88 2016/02/25 14:59:22 wiz Exp $
.\"
.\" Copyright (c) 1997-2003 The NetBSD Foundation, Inc.
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd $Mdocdate: August 12 2021 $
+.Dd $Mdocdate: August 14 2021 $
.Dt EDITLINE 3
.Os
.Sh NAME
If the
.Dv FIONBIO
.Xr ioctl 2
+or the
+.Dv O_NONBLOCK
+.Xr fcntl 2
is set on
.Ar fin ,
.Fn el_gets