title: What is Sid attribute use for in key policies?
body: <p><a href="http://docs.aws.amazon.com/kms/latest/developerguide/key-policies.html" rel="noreferrer">Here</a> is a documentation:</p>
  
  <blockquote>
    <p><strong>Sid</strong> – (Optional) The Sid is a statement identifier, an arbitrary string you can use to identify the statement.</p>
  </blockquote>
  
  <p>Does it means that <code>Sid</code> parameter is just description?</p>