diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index 3572435fcd..8f955b6bbd 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -2058,6 +2058,13 @@ PORTEPOCH=      1</programlisting>
 	      </para>
 	  </listitem>
 
+          <listitem>
+	    <para>Ports which install loadable kernel modules should
+	      have the virtual category <filename>kld</filename> in
+	      their <makevar>CATEGORIES</makevar> line.
+	    </para>
+	  </listitem>
+
 	  <listitem>
 	    <para><filename>misc</filename>
 		  should not appear with any other non-virtual category.