-The [[meta]] and [[tag]] plugins are also recommended. Either the
-[[htmltidy]] or [[htmlbalance]] plugin is suggested, since feeds can easily
-contain html problems, some of which these plugins can fix.
+## requirements
+
+The [[meta]] and [[tag]] plugins are also recommended to be used with this
+one. Either the [[htmltidy]] or [[htmlbalance]] plugin is suggested, since
+feeds can easily contain html problems, some of which these plugins can fix.
+
+Installing the [[!cpan LWPx::ParanoidAgent]] Perl module is strongly
+recommended. The [[!cpan LWP]] module can also be used, but is susceptible
+to server-side request forgery.
+
+## triggering aggregation