--- a/primer/Primer.html	Wed Nov 23 15:32:12 2011 +0000
+++ b/primer/Primer.html	Wed Nov 23 15:32:29 2011 +0000
@@ -187,6 +187,15 @@
      different ways by being described using different <i>attributes</i> (version, location, and 
      so on).
     </p>
+    <p>
+      The characterization of an entity means that the provenance assertions
+      about the entity are only about the thing when it has those attributes.
+      For example, the second version of document D is characterized by being the
+      second version, and so assertions about who reviewed that entity apply only
+      to the document as it is in its second version. When the document becomes
+      the third version, a new entity exists (the third version of D) and the
+      provenance assertions about who reviewed the second version do not apply.
+    </p>
    </section>
 
    <section>