updated docs with 'disable' option

README.md

@@ -199,6 +199,34 @@ To do this, pass options object to `init()` function, like so:
   </script>
 ```
 
+#### Additional configuration
+
+If you want to disable AOS on certain device or under any statement you can set `disable` option. Like so:
+
+```javascript
+  <script>
+    AOS.init({
+      disable: 'mobile'
+    });
+  </script>
+```
+
+There are several options that you can use to fit AOS perfectly into your project, you can pass one of three device types:
+`mobile` (phones and tablets), `phone` or `tablet`. This will disable AOS on those certains devices. But if you want make your own condition, simple type your statement insted of device type name:
+
+```javascript
+  disable: window.innerWidth < 1024
+```
+
+There is also posibility to pass a `function`, which should at the end return `true` or `false`:
+
+```javascript
+  disable: function () {
+    var maxWidth = 1024;
+    return window.innerWidth < maxWidth;
+  }
+```
+
 ## Contribution
 
 I use gulp to concatenate JS & CSS and minify it.