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-rw-r--r--doc/plugins/write.mdwn9
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diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 1aaaf1d1e..8630b56ff 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -413,3 +413,12 @@ See IkiWiki::RCS::Stub for the full list of functions. It's ok if
rcs\_getctime does nothing except for throwing an error.
See [[about_RCS_backends]] for some more info.
+
+## PageSpec plugins
+
+It's also possible to write plugins that add new functions to
+[[PageSpecs|PageSpec]]. Such a plugin should add a function to the
+IkiWiki::PageSpec package, that is named `match_foo`, where "foo()" is
+how it will be accessed in a [[PageSpec]]. The function will be passed two
+parameters: The name of the page being matched, and the thing to match
+against. It should return true if the page matches.