Adding Parameter to Article

Hi,
I want to create a new parameter in my template to display social icons in Joomla articles. I have added the parameter to my templateDetails.xml file like that:

			

				

				

					JNO

					JYES

				

						

			

And in /html/com_content/article/default.php I have added this at the top of the page:

$content_social = ($this->params->get("CONTENT_SOCIAL_ICONS",1));

And this:

	

		social share button is here

	

But when I change the parameter from my Template Manager it doesn't effect whether to display or not. How can I get the template parameter in the Joomla article?

Thanks