diff --git a/share/sgml/freebsd.dtd b/share/sgml/freebsd.dtd
index 29718f7b91..8374f3b226 100644
--- a/share/sgml/freebsd.dtd
+++ b/share/sgml/freebsd.dtd
@@ -7,7 +7,7 @@
 
      The FPI for this DTD is "-//FreeBSD//DTD DocBook V3.1-Based Extension//EN"
 
-     $FreeBSD$
+     $FreeBSD: doc/share/sgml/freebsd.dtd,v 1.3 1999/09/06 06:53:40 peter Exp $
 -->
 
 <!-- ..................................................................... -->
@@ -30,6 +30,17 @@
 <!-- Character level classes -->
 <!ENTITY % local.tech.char.class "|HostID|Username|Devicename|MakeTarget|MakeVar">
 
+<!-- OS Version attributes ...............................................
+
+     Each element has three attributes which specify which version(s) of
+     FreeBSD the element's content applies to.  It is up to the
+     pre-processor to include or exclude elements based on the value of
+     these attributes.                                                     -->
+<!ENTITY % local.common.attrib
+     "OSVersionMin        CDATA        #IMPLIED
+      OSVersionMax        CDATA        #IMPLIED
+      OSVersionIn         CDATA        #IMPLIED">
+
 <!-- Altered general entities ............................................
 
      The HTML 4.0 DTD includes some new ISO entities. Most browsers don't
@@ -44,8 +55,10 @@
 <![ %output.html; [
 <!ENTITY ldquo  "``">
 <!ENTITY rdquo  "''">
-<!ENTITY mdash  "---">
-<!ENTITY ndash  "--">
+<!ENTITY lsquo  "`">
+<!ENTITY rsquo  "'">
+<!ENTITY mdash  "--">
+<!ENTITY ndash  "-">
 <!ENTITY hellip "...">
 <!ENTITY dollar "$">
 ]]>