--- a/ldp-ucr.html	Thu Sep 26 09:54:33 2013 +0100
+++ b/ldp-ucr.html	Thu Sep 26 10:23:10 2013 +0100
@@ -1087,6 +1087,10 @@
 		<li><a>NF4.1</a>: Unrestricted vocabulary: It should be possible be "able
 			to add ... application-specific data" to resources from <a>Maintaining Social Contact Information</a>.
 		</li>
+		<li><a>NF4.2</a>: Multiple changes to a resource: The <a>Project Membership Information</a> user story is concerned with "access to the 'current' state", as distinct from earlier versions. 
+		This is particularly relevant to selective updates which are made with respect to a specific version of the resource description.
+		The LDP must ensure consistent access in the case of multiple simultaneous attempts to update a resource.
+		</li>
 	</ul>
 	
 	<section id="s4.1">
@@ -1597,6 +1601,9 @@
 		<dt><dfn>NF4.1</dfn>:</dt>
 		<dd>The system shall permit unrestricted vocabulary, from <a>UC4</a>.
 		</dd>
+		<dt><dfn>NF4.2</dfn>:</dt>
+		<dd>The LDP shall ensure consistent access in the case of multiple simultaneous attempts to update a resource, from <a>UC4</a>.
+		</dd>
 		<dt><dfn>NF6.1</dfn>:</dt>
 		<dd>The system shall allow resource descriptions that are a "mix of simple data and collections", from <a>UC6</a>.
 		</dd>