--- a/model/ProvenanceModel.html	Fri Dec 16 12:36:02 2011 +0000
+++ b/model/ProvenanceModel.html	Fri Dec 16 12:46:55 2011 +0000
@@ -1552,6 +1552,14 @@
 <section id="record-planLink">
 <h4>Plan Link Record</h4>
 
+<p>Provenance reflects activities that have occurred.  In some  
+cases, those activities reflect the execution of a plan that was  
+designed in advance to guide the execution.  PROV-DM allows attaching  
+a plan to an activity record, which represents what was intended to  
+happen.  The plan can be useful for various tasks, for example to  
+validate the execution as represented in the provenance record, to  
+manage expectation failures, or to provide explanations.</p>
+
 <p>In the context of PROV-DM, a <dfn>plan</dfn> should be understood as a set of
 actions or steps intended to achieve some goal. PROV-DM is not
 prescriptive about the nature of plans, their representation, the