Fixed some mistakes in README

README.md

@@ -265,9 +265,8 @@ Keybinding         | Description
 <kbd>F11</kbd>     | Make the window full screen.
 <kbd>F12</kbd>     | Toggle the Emacs menu bar.
 <kbd>C-x g</kbd>   | Open Magit's status buffer.
-<kbd>M-Z</kbd>     | Zap up to char
-<kbd>C-c J</kbd>   | Open the buffer menu and go to the selected buffer in the current window.
-<kbd>Super-></kbd> | Open the buffer menu and go to the selected buffer in the current window.
+<kbd>M-Z</kbd>     | Zap up to char.
+<kbd>C-c J</kbd> or <kbd>Super-></kbd>   | Switch between buffers with [`ace-jump-buffer`](https://github.com/waymondo/ace-jump-buffer)
 <kbd>C-=</kbd>     | Run `expand-region` (incremental text selection).
 <kbd>C-a</kbd>     | Run `prelude-move-beginning-of-line`. Read [this](http://emacsredux.com/blog/2013/05/22/smarter-navigation-to-the-beginning-of-a-line/) for details.