Minor correction about meta tag location (package.opf)

index.html

@@ -57,7 +57,7 @@ <h2>Additional notes</h2>
 	    <li>Scripts for converting to and from the intermediary single-HTML representation of the publications are also provided. These are useful either for debugging, or if a single-document HTML representation is needed as input to or output from an HTML-based production system.</li>
 	    <li>In the 2015-1 Nordic Guidelines, math is marked up using ASCIIMath. An experimental script for converting this ASCIIMath to MathML is provided.</li>
 	    <li>The grammar used in the EPUB 3, HTML and DTBook files—the Nordic Guidelines—is a strict subset of EPUB 3, HTML and DTBook. Most DTBooks will work with these scripts. There are few limitations to the input DTBook grammar. There are more limitations to the HTML/EPUB 3 grammar however, because there must be a way to convert it to DTBook. Most notably, multimedia such as audio and video are currently not allowed in these EPUB 3s.</li>
-	    <li>The Nordic EPUB3 Validator script can validate according to both 2015-1 and 2020-1 rulesets. Which ruleset will be applied is determined by the value of the <code>&lt;meta property="nordic:guidelines"&gt;</code> element.</li>
+	    <li>The Nordic EPUB3 Validator script can validate according to both 2015-1 and 2020-1 rulesets. Which ruleset will be applied is determined by the value of the <code>&lt;meta property="nordic:guidelines"&gt;</code> element in <code>package.opf</code>.</li>
 	  </ul>
           <h1><a name="installation" class="anchor" href="#installation"><span class="octicon octicon-link"></span></a>Installation</h1>
           <p><strong>Latest version: 1.5.2 (note, Docker-only version!)</strong></p>