12 to 13 guidelines

Author: alastc

understanding/intro.html

@@ -85,7 +85,7 @@ <h2>Understanding the Four Principles of Accessibility</h2>
 			<h2>Layers of Guidance</h2>
 			<section>
 				<h3>The Guidelines</h3>
-				<p>Under each principle there is a list of guidelines that address the principle. There are a total of 12 guidelines. A convenient list of just the guidelines can be found in the <a class="gl-ref" href="https://www.w3.org/TR/WCAG21/#toc">WCAG 2.1 table of contents</a>. One of the key objectives of the guidelines is to ensure that content is directly accessible to as many people as possible, and capable of being re-presented in different forms to match different peoples' sensory, physical and cognitive abilities.</p>
+				<p>Under each principle there is a list of guidelines that address the principle. There are a total of 13 guidelines. A convenient list of just the guidelines can be found in the <a class="gl-ref" href="https://www.w3.org/TR/WCAG21/#toc">WCAG 2.1 table of contents</a>. One of the key objectives of the guidelines is to ensure that content is directly accessible to as many people as possible, and capable of being re-presented in different forms to match different peoples' sensory, physical and cognitive abilities.</p>
 			</section>
 			<section>
 				<h3>Success Criteria</h3>