--- src/usr.bin/m4/m4.1	2007/01/01 00:41:58	1.4
+++ src/usr.bin/m4/m4.1	2007/07/30 22:11:33	1.5
@@ -421,7 +421,8 @@ conforms to
 .Sh HISTORY
 An
 .Nm
-command appeared in PWB UNIX.
+command appeared in PWB
+.Ux .
 .Sh AUTHORS
 .An -nosplit
 .An Ozan Yigit Aq oz@sis.yorku.ca