-// Grouping with array()
-// 'unique_name' => array('a.example.org', 'b.example.org')
+// NOTE FOR ADMINISTRATORS:
+//
+// Host selection:
+// [1] '.example.org' prohibits ALL "example.org"-related FQDN
+// [2] '*.example.org' prohibits ONLY subdomains and hosts, EXCEPT "www.example.org"
+// [3] 'example.org' prohibits BOTH "example.org" and "www.example.org"
+// (Now you know, [1] = [2] + [3])
+//
+// How to write multiple hosts as an group:
+// 'Group Name' => array('a.example.org', 'b.example.com', 'c.example.net'),
+//
+// How to write regular expression:
+// 'Group Name' => '#^(?:.*\.)?what-you-want\.com$#',