diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index 906c10e500..dcf39165d2 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -3282,6 +3282,19 @@ ALWAYS_KEEP_DISTFILES=  yes
 	    same as <makevar>DEPENDS_TARGET</makevar>.</para>
 	</sect2>
 
+	<sect2>
+	  <title><makevar>PERL_BUILD_DEPENDS</makevar> and
+	    <makevar>PERL_RUN_DEPENDS</makevar></title>
+
+	  <para>These variables allow you to specify dependencies on Perl
+	    modules. For example,
+
+	    <programlisting>PERL_RUN_DEPENDS=	MIME::Base64:${PORTSDIR}/converters/p5-MIME-Base64</programlisting>
+
+	    will check for <literal>MIME::Base64</literal> Perl module
+	    and install it if it is missing.</para>
+	</sect2>
+
 	<sect2>
 	  <title><makevar>DEPENDS</makevar></title>