Added manifest extensions property

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@113323 13f79535-47bb-0310-9956-ffa450edef68

jar/xdocs/properties.xml

@@ -219,6 +219,15 @@
             property will override Maven's defaults.
           </td>
         </tr>
+        <tr>
+          <td>maven.jar.manifest.extensions.add</td>
+          <td>Yes</td>
+          <td>
+            Tells maven to add extension information the the jar manifest.
+            This can cause some applications to break, so it has been disabled by default.
+            Set to 'true' to enable extension information.
+          </td>
+        </tr>
         <tr>
           <td>maven.jar.mainclass</td>
           <td>Yes</td>