Update help.html

src/ui/pages/help.html

@@ -943,7 +943,10 @@
 							<li>The last saved path cannot be remembered by default. To circumvent this limitation,
 								disable the option "Misc. &gt; Save pages in background".</li>
 							<li>The following characters are replaced with _ in filenames: ~, +, \, ?, %, *, :, |, ",
-								&lt;, &gt;</li>
+								&lt;, &gt; This is done to maintain compatibility with various OSs and file systems. 
+								If you don't need that level of compatibility and know what you are doing, you can 
+								change the list of forbidden characters in 
+								<a href="https://github.com/gildas-lormeau/SingleFile/wiki/Hidden-options">Hidden options</a>.</li>
 						</ul>
 					</li>
 					<li>Chromium-based browsers
@@ -1036,4 +1039,4 @@
 	<script type="module" src="../bg/ui-help.js"></script>
 </body>
 
-</html>
+</html>