diff --git a/IkiWiki/Plugin/underlay.pm b/IkiWiki/Plugin/underlay.pm
new file mode 100644
index 000000000..380d418fb
--- /dev/null
+++ b/IkiWiki/Plugin/underlay.pm
@@ -0,0 +1,40 @@
+#!/usr/bin/perl
+package IkiWiki::Plugin::underlay;
+# Copyright © 2008 Simon McVittie <http://smcv.pseudorandom.co.uk/>
+# Licensed under the GNU GPL, version 2, or any later version published by the
+# Free Software Foundation
+
+use warnings;
+use strict;
+use IkiWiki 3.00;
+
+sub import {
+	hook(type => "getsetup", id => "underlay",  call => \&getsetup);
+	hook(type => "checkconfig", id => "underlay", call => \&checkconfig);
+}
+
+sub getsetup () {
+	return
+		plugin => {
+			safe => 0,
+			rebuild => undef,
+		},
+		add_underlays => {
+			type => "string",
+			default => [],
+			description => "extra underlay directories to add",
+			advanced => 1,
+			safe => 0,
+			rebuild => 1,
+		},
+}
+
+sub checkconfig () {
+	return unless exists $config{add_underlays};
+
+	foreach my $dir (@{$config{add_underlays}}) {
+		add_underlay($dir);
+	}
+}
+
+1;
diff --git a/doc/plugins/contrib/underlay.mdwn b/doc/plugins/contrib/underlay.mdwn
deleted file mode 100644
index 72893c992..000000000
--- a/doc/plugins/contrib/underlay.mdwn
+++ /dev/null
@@ -1,58 +0,0 @@
-[[!template id=plugin name=underlay author="[[Simon_McVittie|smcv]]"]]
-[[!tag type/useful]]
-
-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.
-
-Please feel free to add this plugin to ikiwiki if it seems like a good
-thing to have. See the 'underlay' branch in my git repository.
-
-    #!/usr/bin/perl
-    package IkiWiki::Plugin::underlay;
-    # Copyright © 2008 Simon McVittie <http://smcv.pseudorandom.co.uk/>
-    # Licensed under the GNU GPL, version 2, or any later version published by the
-    # Free Software Foundation
-
-    use warnings;
-    use strict;
-    use IkiWiki 2.00;
-
-    sub import {
-    	hook(type => "getsetup", id => "underlay",  call => \&getsetup);
-    	hook(type => "checkconfig", id => "underlay", call => \&checkconfig);
-    }
-
-    sub getsetup () {
-    	return
-    		plugin => {
-    			safe => 0,
-    			rebuild => undef,
-    		},
-    		add_underlays => {
-    			type => "string",
-    			default => [],
-    			description => "extra underlay directories to add",
-    			advanced => 1,
-    			safe => 0,
-    			rebuild => 1,
-    		},
-    }
-
-    sub checkconfig () {
-    	return unless exists $config{add_underlays};
-
-    	foreach my $dir (@{$config{add_underlays}}) {
-    		add_underlay($dir);
-    	}
-    }
-
-    1;
diff --git a/doc/plugins/underlay.mdwn b/doc/plugins/underlay.mdwn
new file mode 100644
index 000000000..09d096a6e
--- /dev/null
+++ b/doc/plugins/underlay.mdwn
@@ -0,0 +1,14 @@
+[[!template id=plugin name=underlay author="[[Simon_McVittie|smcv]]"]]
+[[!tag type/useful]]
+
+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.