preserveInTarget has been introduced with Ant 1.7.0

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@763656 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/sync.html

@@ -105,6 +105,8 @@ supported as a nested element.</p>
 
 <h4>preserveInTarget</h4>
 
+<p><em>Since Ant 1.7.0</em></p>
+
 <p>Specifies files or directories that should be kept in the target
 directory even if they are not present in one of the source
 directories.</p>