diff --git a/jar/plugin.jelly b/jar/plugin.jelly
index f3bc2f9c..37f23217 100644
--- a/jar/plugin.jelly
+++ b/jar/plugin.jelly
@@ -24,6 +24,8 @@
     <ant:available property="maven.jar.manifest.available" 
       file="${maven.jar.manifest}"/>
 
+	<!-- See http://java.sun.com/j2se/1.3/docs/guide/jar/jar.html -->
+	<!-- See http://java.sun.com/j2se/1.4.1/docs/guide/jar/jar.html -->
     <ant:jar
       jarfile="${maven.build.dir}/${maven.final.name}.jar"
       basedir="${maven.build.dest}"
@@ -54,7 +56,21 @@
         <j:set var="mainclass" value="${pom.getPluginContext('maven-java-plugin').getVariable('maven.jar.mainclass')}"/>
         <j:if test="${!empty(mainclass)}">
             <ant:attribute name="Main-Class" value="${mainclass}"/>
-        </j:if>        
+        </j:if>
+        <j:set var="extensionList" value=""/>
+        <j:forEach var="artifact" items="${pom.artifacts}">
+          <j:set var="dep" value="${artifact.dependency}"/>
+	      <j:set var="extensionList" value="${extensionList},${dep.artifactId}"/>
+        </j:forEach>
+        <j:set var="extensionList" value="${extensionList.substring(1)}"/>
+        <ant:attribute name="Extension-List" value="${extensionList}"/>
+        
+        <j:forEach var="artifact" items="${pom.artifacts}">
+          <j:set var="dep" value="${artifact.dependency}"/>
+	      <ant:attribute name="${dep.artifactId}-Extension-Name" value="${dep.artifactId}"/>
+		  <ant:attribute name="${dep.artifactId}-Implementation-Version" value="${dep.version}"/>
+		  <ant:attribute name="${dep.artifactId}-Implementation-URL" value="http://www.ibiblio.org/maven${artifact.urlPath}"/>
+        </j:forEach>        
       </ant:manifest>
     </ant:jar>
   </goal>