additional clarification to the text on unicode support

epub33/a11y/index.html

@@ -151,10 +151,13 @@ <h4>Internationalization</h4>
 						regardless of their preferred reading modality.</p>
 
 					<p>At the same time, the language and writing conventions of the authored text will influence the
-						techniques necessary to meet the accessibility requirements. The fact that EPUB <a
+						techniques necessary to meet the accessibility requirements. EPUB <a
 							href="https://www.w3.org/TR/epub-33/#confreq-xml-enc">requires support for Unicode text</a>
-						[[EPUB-3]], for example, is not enough on its own to ensure that the text in any given language
-						is fully accessible even though it ensures the correct character data can be used.</p>
+						[[EPUB-3]], for example, which ensures the correct character data can be used (i.e., EPUB
+						Creators do not have to use images of text). Although this is an important feature, it is often
+						not enough on its own to ensure that the text is fully accessible in any given language (e.g.,
+						additional information about directionality, emphasis, pronunciation, etc. may also be
+						neeed).</p>
 
 					<p>As a consequence, there may be language- or culture-specific practices for meeting accessibility
 						requirements. Whether these practices are defined within this specification and its techniques