Further updates

Per comments from Chris and Bruce in issue #640
w3c · Jun 15, 2022 · 681a9c4 · 681a9c4
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diff --git a/how-tos/visual-contrast-of-text/get-started.html b/how-tos/visual-contrast-of-text/get-started.html
@@ -43,7 +43,7 @@ <h2>Who it helps</h2>
 				<h2>How</h2>
 				<p>Authors need to balance font size, font stroke width, background color, font color, and nearby colors to achieve good visual contrast. Authors can use tools to evaluate elements that predict the needed visual contrast for a given font size and weight to achieve a presentation which meets these requirements.
 				</p>
-				<p>The complex, interrelated nature of font and graphic elements to provide visual readability is aided by the use of the APCA (Accessible Perceptual Contrast Algorithm) which allows authors to input color pairs to find a predicted contrast value. That contrast value then defines the minimum useable font weight and size. 
+				<p>To conform to readability contrast guidelines, use an APCA compliant contrast calculator. An APCA (Accessible Perceptual Contrast Algorithm) based tool allows authors to test a pair of colors and calculate a predicted contrast value. This defines the minimum useable font weight and size. 
 				</p>
 			</section>
 		</main>

diff --git a/how-tos/visual-contrast-of-text/resources.html b/how-tos/visual-contrast-of-text/resources.html
@@ -9,9 +9,10 @@ <h1>Resources</h1>
 		</header>
 		<main>
 			<ul>
-				<li><a href="https://www.myndex.com/APCA/">APCA  Tool</a></li> A live web app that calculates readability contrast.
+				<li><a href="https://git.apcacontrast.com/documentation/WhyAPCA.html">"Why APCA"</a> A plain language introduction to readability contrast.
+			  <li><a href="https://developer.mozilla.org/en-US/docs/Web/Accessibility/Understanding_Colors_and_Luminance">Introduction to Color and Accessibility</a> A further tutorial on color and accessibility.
+				<li><a href="https://www.myndex.com/APCA/">APCA Tool</a></li> A live web app that calculates readability contrast.
 				<li><a href="https://www.myndex.com/CVD/">Color Vision Deficiency Simulator</a></li> A clinically accurate simulation of color insensitive vision.
-				<li><a href="">"Why APCA"</a> A plain language introduction to readability contrast.
 			</ul>
 		</main>
 	</body>