diff --git a/extensions/help/resources/locale/en-US/cs_nav_prefs_navigator.xhtml b/extensions/help/resources/locale/en-US/cs_nav_prefs_navigator.xhtml
index a07d208a5cdd..d1528b3f2092 100644
--- a/extensions/help/resources/locale/en-US/cs_nav_prefs_navigator.xhtml
+++ b/extensions/help/resources/locale/en-US/cs_nav_prefs_navigator.xhtml
@@ -229,8 +229,6 @@
             selected file type.</li>
           <li><strong>Extension(s)</strong>: Displays the file extension(s) of
             the selected file type.</li>
-          <li><strong>MIME type</strong>: Displays the MIME type of the
-            selected file type.</li>
           <li><strong>When encountered</strong>: Displays what kind of action
             that will be taken when &brandShortName; encounters the selected
             file type.</li>
@@ -568,6 +566,9 @@
         a download is completed. Use the Browse button to select the sound file
         in the file locator. To listen to the sound you&apos;ve chosen, click
         Preview.</li>
+      <li><strong>Show an alert</strong>: Select this if you want
+        &brandShortName; to show an alert on the screen when a download is
+        completed.</li>
     </ul>
   </li>
 </ul>