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+ikiwiki supports placing pages in a directory hierarchy. For example,
+this page, [[SubPage]] has some related pages placed under it, like
+[[SubPage/LinkingRules]]. This is a useful way to add some order to your
+wiki rather than just having a great big directory full of pages.
+
+To add a SubPage, just make a subdirectory and put pages in it. For
+example, this page is SubPage.mdwn in this wiki's source, and there is also
+a SubPage subdirectory, which contains SubPage/LinkingRules.mdwn. Subpages
+can be nested as deeply as you'd like.
+
+Linking to and from a SubPage is explained in [[LinkingRules]].