README.md in fusuma-0.1.7 vs README.md in fusuma-0.1.8

@@ -61,9 +61,11 @@
     shortcut: 'ctrl+plus'
   out:
      shortcut: 'ctrl+minus'
 ```
 
+if `shortcut: ` is blank, the swipe/pinch doesn't trigger a keyevent.
+
 ## Options
 
 *   `-v` : Enable debug mode.
 
 ## Contributing