diff --git a/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml b/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
index 63f78c5179..79362f24f3 100644
--- a/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
+++ b/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
@@ -6043,7 +6043,14 @@ FOO_CONFIGURE_ENABLE=	foo</programlisting>
 	    <varname>SUB_LIST</varname></term>
 
 	  <listitem>
-	    <para>See <xref linkend="options_sub"/>.</para>
+	    <para>For automatic
+	      <literal>%%<replaceable>OPT</replaceable>%%</literal>
+	      and
+	      <literal>%%NO_<replaceable>OPT</replaceable>%%</literal>
+	      generation, see <xref linkend="options_sub"/>.</para>
+
+	    <para>For more complex usage, see <xref
+	      linkend="options-variables"/>.</para>
 	  </listitem>
 	</varlistentry>