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-rw-r--r--doc/plugins/write.mdwn16
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diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 0bf6fcf48..e33c99421 100644
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@@ -966,6 +966,22 @@ added. Pass it the page that contains the link, and the link text.
An optional third parameter sets the link type. If not specified,
it is an ordinary [[ikiwiki/WikiLink]].
+### `add_autofile($$$)`
+
+Sometimes you may want to add a file to the `srcdir`. For example,
+[[plugins/tag]] pages can be automatically created as needed. This function
+can be used to do that.
+
+The three parameters are the filename to add, the name of the plugin,
+and a callback function. The callback will be called if it is appropriate
+to automatically add the file, and should then take care of creating it,
+and doing anything else it needs to (such as checking it into revision
+control). Note that the callback may not always be called. For example,
+if an automatically added file is deleted by the user, ikiwiki will avoid
+re-adding it again.
+
+This function needs to be called during the scan hook, or earlier to work.
+
## Miscellaneous
### Internal use pages