SharePoint 2013 - How to properly add meta data from a custom page layout

I would like to add this specific line to my SharPoint pages...

<meta name="viewport" content="user-scalable=yes, width=1024, initial-scale=1.0, maximum-scale=5.0, minimum-scale=0.25"/>

But do it from the custom page layout, not from the master template. Is this possible? Every time I add this line to my page layout and publish it, I do not see it on a production page.

thanks