--- a/rdf-concepts/index.html	Tue Feb 11 19:48:03 2014 +0100
+++ b/rdf-concepts/index.html	Tue Feb 11 19:48:28 2014 +0100
@@ -132,7 +132,10 @@
   </section>
 
   <section id="sotd">
-    <p>This document is part of the RDF 1.1 document suite. </p>
+    <p>This document is part of the RDF 1.1 document suite. It is the
+    central RDF 1.1 document and defines the core RDF concepts. A new
+    concept in RDF 1.1 is the notion of an RDF dataset to represent
+    multiple graphs. </p>
   </section>
 
 <section id="section-Introduction" class="informative">