diff --git a/share/sgml/freebsd.ent b/share/sgml/freebsd.ent
index ac07917e20..337a45b319 100644
--- a/share/sgml/freebsd.ent
+++ b/share/sgml/freebsd.ent
@@ -16,6 +16,21 @@ used in both environments.
 <!ENTITY os.current "&os;-CURRENT">
 <!ENTITY os.stable "&os;-STABLE">
 
+<!-- Entities for various architectures.  These are to be used
+     only for denoting a variant of FreeBSD for a particular
+     architecture (e.g. &os;/&arch.i386;).  Other entities should
+     be used when referring generically to an architecture,
+     particularly because entities such as &i386; properly
+     denote trademarks and registered trademarks. -->
+<!ENTITY arch.amd64 "amd64">
+<!ENTITY arch.arm "arm">
+<!ENTITY arch.i386 "i386">
+<!ENTITY arch.ia64 "ia64">
+<!ENTITY arch.pc98 "pc98">
+<!ENTITY arch.powerpc "powerpc">
+<!ENTITY arch.sparc64 "sparc64">
+<!ENTITY arch.sun4v "sun4v">
+
 <!--
   Use this entity when referring to 'UNIX' in your document.
 -->