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diff --git a/doc/plugins/contrib/siterel2pagerel.mdwn b/doc/plugins/contrib/siterel2pagerel.mdwn
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+[[!template id=plugin name=siterel2pagerel author="[[PaulWise]]"]]
+
+This is a simple plugin to convert all site-relative links to page-relative
+links (converts /foo into ../../../foo or similar). It works as a
+postprocessing filter, allowing it to work on mdwn, wiki, html, rst and any
+other format that produces html. The code is available here:
+
+	#!/usr/bin/perl
+	# quick HTML siterel2pagerel link hack by Paul Wise
+	package IkiWiki::Plugin::siterel2pagerel;
+
+	use warnings;
+	use strict;
+	use IkiWiki 2.00;
+
+	sub import {
+	        hook(type => "sanitize", id => "siterel2pagerel", call => \&siterel2pagerel);
+	}
+
+	sub siterel2pagerel (@) {
+	        my %params=@_;
+	        my $baseurl=IkiWiki::baseurl($params{page});
+	        my $content=$params{content};
+	        $content=~s/(<a(?:\s+(?:class|id)\s*="?\w+"?)?)\s+href=\s*"\/([^"]*)"/$1 href="$baseurl$2"/mig;
+	        $content=~s/(<img(?:\s+(?:class|id|width|height)\s*="?\w+"?)*)\s+src=\s*"\/([^"]*)"/$1 src="$baseurl$2"/mig;
+	        # FIXME: do <script and everything else that can have URLs in it
+	        return $content;
+	}
+
+	1