The manual page for mount_tmpfs(8) states that it was included in OpenBSD 5.4, when the first -release with tmpfs was 5.5.
Corrected in the following diff: Index: sbin/mount_tmpfs/mount_tmpfs.8 =================================================================== RCS file: /cvs/src/sbin/mount_tmpfs/mount_tmpfs.8,v retrieving revision 1.3 diff -u -p -r1.3 mount_tmpfs.8 --- sbin/mount_tmpfs/mount_tmpfs.8 5 Feb 2014 15:32:26 -0000 1.3 +++ sbin/mount_tmpfs/mount_tmpfs.8 16 Nov 2014 01:44:22 -0000 @@ -133,7 +133,7 @@ The utility first appeared in .Nx 4.0 and -.Ox 5.4 . +.Ox 5.5 . .Sh CAVEATS The update of mount options (through mount -u) is currently not supported. .Sh BUGS
