CSS3 Validator and Media Queries

I've included a CSS3 media query which meets all the requirements specified for CSS3 media queries and yet it doesn't validate.

Media Query: 	<link rel="stylesheet" media="only screen and (max-device-width: 480px)" href="./iphone.css" type="text/css" />
Page:			http://www.grela.co.uk

		   Philip Osborne

		   DiscoverySquare
	  	   Website & Graphic Design

          web www.discoverysquare.co.uk
        email studio@discoverysquare.co.uk
 telephone 0151 3242158
      mobile 07974 320158

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