doc concat as RC

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@556999 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/concat.html

@@ -35,6 +35,12 @@
         file will be created if it does not exist.
       </p>
 
+      <p><strong>Since Ant 1.7.1</strong>, this task can be used as a
+        <a href="../CoreTypes/resources.html#collection">Resource Collection</a>
+        that will return exactly one 
+        <a href="../CoreTypes/resources.html">resource</a>.
+      </p>
+
       <p>
         <a href="../CoreTypes/resources.html#collection">
 Resource Collection</a>s are used to