updating copyright notice again

index.html

@@ -738,7 +738,9 @@
                 The Font Awesome webfont, CSS, and LESS files are licensed under
                 <a href="http://creativecommons.org/licenses/by/3.0/">CC BY 3.0</a>.
                 A mention of <code>Font Awesome - http://fortawesome.github.com/Font-Awesome</code> in human-readable source code
-                is considered acceptable attribution.
+                is considered acceptable attribution (most common on the web). If human readable source code is not available to
+                the end user, a mention in an 'About' or 'Credits' screen is considered acceptable (most common in desktop or
+                mobile software).
             </div>
         </div>