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+[[!template id=plugin name=underlay author="[[Simon_McVittie|smcv]]"]]
+[[!tag type/special-purpose]]
+
+This plugin adds an `add_underlays` option to the setup file. Its value is
+a list of underlay directories whose content is added to the wiki.
+
+Multiple underlays are normally set up automatically by other plugins (for
+instance, the images used by the [[plugins/smiley]] plugin), but they can
+also be used as a way to pull in external files that you don't want in
+revision control, like photos or software releases.
+
+Directories in `add_underlays` should usually be absolute. If relative,
+they're interpreted as relative to the parent directory of the basewiki
+underlay, which is probably not particularly useful in this context.