It also seems that the man-pages are partly wrong, ( the services.db 
file is (on my system at least) not in /etc)
so I would suggest to incorporate the patches below.
As well as an indication in inetd.5 (if anyone feels the need for it)

- sorry if the preveous tone was a bit harsh -


cheers thilo


Index: share/man/man5/services.5
===================================================================
RCS file: /cvsroot/src/share/man/man5/services.5,v
retrieving revision 1.8
diff -u -r1.8 services.5
--- share/man/man5/services.5	7 Aug 2003 10:31:17 -0000	1.8
+++ share/man/man5/services.5	19 Jun 2007 12:10:59 -0000
@@ -68,6 +68,11 @@
 Service names may contain any printable
 character other than a field delimiter, newline,
 or comment character.
+.Pp
+The database in /var/db/services.db 
+needs to be updated with 
+.Nm services_mkdb
+after changes to the services file have been applied.
 .Sh FILES
 .Bl -tag -width /etc/services -compact
 .It Pa /etc/services
@@ -78,6 +83,7 @@
 .El
 .Sh SEE ALSO
 .Xr getservent 3
+.Xr services_mkdb 8
 .Sh HISTORY
 The
 .Nm
Index: usr.sbin/services_mkdb/services_mkdb.8
===================================================================
RCS file: /cvsroot/src/usr.sbin/services_mkdb/services_mkdb.8,v
retrieving revision 1.5
diff -u -r1.5 services_mkdb.8
--- usr.sbin/services_mkdb/services_mkdb.8	8 May 2007 20:14:59 -0000	1.5
+++ usr.sbin/services_mkdb/services_mkdb.8	19 Jun 2007 12:10:59 -0000
@@ -73,9 +73,9 @@
 exits zero on success, non-zero on failure.
 .Sh FILES
 .Bl -tag -width 24n -compact
-.It Pa /etc/services.db
+.It Pa /var/db/services.db
 The current services database.
-.It Pa /etc/services.db.tmp
+.It Pa /var/db/services.db.tmp
 A temporary file.
 .It Pa /etc/services
 The current services file.