mknod(2) appeared in SUSv1.[1]  The function was added to POSIX.1-2001
when POSIX and SUS merged, but as an XSI extension (still SUS-only).[2]

[1] X/Open CAE Specification, System Interfaces and Headers Issue 4,
Version 2, Chapter 3 "System Interfaces", pp. 392-393.
[2] IEEE Std 1003.1-2001, Volume 2, Chapter 3 "System Interfaces", pp.
758-760.
<https://pubs.opengroup.org/onlinepubs/009604499/functions/mknod.html>

Signed-off-by: Seth McDonald <redacted>
---
 man/man2/mknod.2 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/man/man2/mknod.2 b/man/man2/mknod.2
index 4a9aa9f6128a..f628ee5afe8d 100644
--- a/man/man2/mknod.2
+++ b/man/man2/mknod.2

@@ -266,7 +266,10 @@ .SH STANDARDS
 .SH HISTORY
 .TP
 .BR mknod ()
-SVr4, 4.4BSD, POSIX.1-2001 (but see VERSIONS).
+SVr4,
+4.4BSD,
+SUSv1,
+POSIX.1-2001 XSI (but see VERSIONS).
 .\" The Linux version differs from the SVr4 version in that it
 .\" does not require root permission to create pipes, also in that no
 .\" EMULTIHOP, ENOLINK, or EINTR error is documented.

-- 
2.47.3