Update index.md

Author: vanand17

src/connections/sources/catalog/libraries/website/plugins/youtube/index.md

@@ -21,7 +21,7 @@ After you've generated the API key:
 
     **Note:** Only JavaScript sources support plugins.
 
-2. Initialize the plugin by giving it access to the YouTube video player instance(s) running on your page.
+2. Initialize the plugin by giving it access to the YouTube video player instance(s) running on your page. This can be done by adding this script,  <script src="https://www.youtube.com/iframe_api"></script> to the section of the source code where the page loads.
 - Use the initialize method in the YouTube `onYouTubeIframeAPIReady()` function to register and initialize the plugin with the player instance and your API key:
 
 ```js