add

basewiki/subpage.mdwn

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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]].

basewiki/subpage/linkingrules.mdwn

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+To link to or from a [[SubPage]], you can normally use a regular
+[[WikiLink]] that does not contain the name of the parent directory of
+the [[SubPage]]. Ikiwiki descends the directory hierarchy looking for a
+page that matches your link.
+
+For example, if FooBar/SubPage links to "OtherPage", ikiwiki will first 
+prefer pointing the link to FooBar/SubPage/OtherPage if it exists, next
+to FooBar/OtherPage and finally to OtherPage in the root of the wiki.
+
+Note that this means that if a link on FooBar/SomePage to "OtherPage"
+currently links to OtherPage, in the root of the wiki, and FooBar/OtherPage
+is created, the link will _change_ to point to FooBar/OtherPage. On the
+other hand, a link from BazBar to "OtherPage" would be unchanged by this
+creation of a [[SubPage]] of FooBar.
+
+You can also specify a link that contains a directory name, like
+"FooBar/OtherPage" to more exactly specify what page to link to. This is
+the only way to link to an unrelated [[SubPage]].
+
+You can use this to, for example, to link from BazBar to "FooBar/SubPage",
+or from BazBar/SubPage to "FooBar/SubPage".