added a note about the last saved path

README.MD

@@ -37,6 +37,7 @@ See the extension help in the options page for more detailed information about t
 ## Known Issues
 - All browsers:
   - For security reasons, you cannot save pages hosted on https://chrome.google.com or https://addons.mozilla.org.
+  - The last saved path cannot be remembered by default. To circumvent this limitation, disable the option "Save pages in background".
 - Chrome/Opera:
   - You must enable the option "Allow access to file URLs" in the extension page to display the infobar when viewing a saved page, or to save a page stored on the filesystem.  
 - Firefox:

extension/ui/pages/help.html

@@ -419,6 +419,8 @@
 						<ul>
 							<li>For security reasons, you cannot save pages hosted on https://chrome.google.com or
 								https://addons.mozilla.org.</li>
+							<li>The last saved path cannot be remembered by default. To circumvent this limitation, disable the option "Save
+								pages in background".</li>
 						</ul>
 					</li>
 					<li>