diff --git a/docs/index.html b/docs/index.html
index 8f3bc2b59..78d0b8e73 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -2878,10 +2878,15 @@
     <li>If you wish to remap emulation events, click the 'Emul. Events' tab.
       Otherwise, click the 'UI Events' tab for user interface events.</li>
     <li>Select event you want to remap and click the 'Map' button.</li>
-    <li>Press a key (or a modifier+key combination) or a joystick button, and that
-      key/button will be bound to the selected event. If nothing seems to happen,
-      either Stella can't see the input device, or the selected event doesn't
-      support being remapped to the input device.</li>
+    <li>Press a key, a modifier key (Control, Shift...), a modifier+key combination or
+    use a controller direction or button. Then that key (combination) or controller
+    action will be bound to the selected event. </br>
+      Notes:<ul>
+	  <li>If nothing seems to happen, Stella can't see the input device.</li>
+      <li>Events which are available in both event modes can be remapped individually.</li>
+      <li>Left and right modifiers are mapped separately. To map them as one, press both
+      modifier keys during mapping.</li>
+      </ul></li>
     <li>Cancel a remap in progress by clicking 'Cancel', erase a mapping by
       clicking 'Erase', or reset to default mapping by clicking 'Reset'</li>
     <li>Reset to default <b>all</b> mappings by clicking 'Defaults'.</li>