Update README.md

Author: shivamdevs

README.md

@@ -10,6 +10,9 @@ Dependent on [jScript](https://github.com/shivamdevs/jScript) Library.
 <script src="https://cdn.jsdelivr.net/gh/shivamdevs/dom-selector/selector.min.js" defer></script>
 ```
 > Adding `defer` can help delay **Dom-Selector** loading, preventing it from increasing page load time.
+### Limitation
+* Restricted to top window only
+* jScript Library dependency
 ### Contribution
 * [@Shivamdevs](https://github.com/shivamdevs)
 * [@shivamdewangan](https://github.com/shivamdewangan)