--- a/spec/latest/json-ld-syntax/index.html	Tue Sep 11 15:03:20 2012 -0700
+++ b/spec/latest/json-ld-syntax/index.html	Wed Sep 19 11:09:31 2012 +0200
@@ -2928,7 +2928,7 @@
   definition</tref> (see <a href="#expanded-term-definition"></a>).</p>
 <p>An <tdef>expanded term definition</tdef> is composed of zero or more keys from <code>@id</code>,
   <code>@type</code>, <code>@language</code> or <code>@container</code>. An
-  <tref>expanded term definition</tref> MUST NOT contain any other keys.
+  <tref>expanded term definition</tref> SHOULD NOT contain any other keys.
   All values associated with <code>@id</code> MUST expand to an <tref>absolute IRI</tref>.</p>
 <p>If the <tref>term</tref> definition is not a <tref>compact IRI</tref> or <tref>absolute IRI</tref>,
   the <tref>expanded term