--- src/usr.bin/xargs/xargs.1	2004/03/11 12:28:58	1.3
+++ src/usr.bin/xargs/xargs.1	2007/07/30 22:11:33	1.4
@@ -294,7 +294,8 @@ extensions which may not be available on
 .Sh HISTORY
 The
 .Nm
-command appeared in PWB UNIX.
+command appeared in PWB
+.Ux .
 .Sh BUGS
 If
 .Ar utility