wait was present in v1 https://www.bell-labs.com/usr/dmr/www/man22.pdfdiff -r1.39 -r1.40 src/lib/libc/sys/wait.2
(sevan)
--- src/lib/libc/sys/wait.2 2016/11/20 09:38:37 1.39
+++ src/lib/libc/sys/wait.2 2019/09/02 00:12:11 1.40
@@ -1,4 +1,4 @@
-.\" $NetBSD: wait.2,v 1.39 2016/11/20 09:38:37 wiz Exp $
+.\" $NetBSD: wait.2,v 1.40 2019/09/02 00:12:11 sevan Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993, 1994
.\" The Regents of the University of California. All rights reserved.
@@ -29,7 +29,7 @@
.\"
.\" @(#)wait.2 8.2 (Berkeley) 4/19/94
.\"
-.Dd November 10, 2016
+.Dd September 2, 2019
.Dt WAIT 2
.Os
.Sh NAME
@@ -659,4 +659,4 @@
A
.Fn wait
function call appeared in
-.At v2 .
+.At v1 .