diff --git a/src/main/org/apache/tools/ant/taskdefs/defaults.properties b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
index 6149f4c71..d2b3a4b1c 100644
--- a/src/main/org/apache/tools/ant/taskdefs/defaults.properties
+++ b/src/main/org/apache/tools/ant/taskdefs/defaults.properties
@@ -159,6 +159,7 @@ soslabel=org.apache.tools.ant.taskdefs.optional.sos.SOSLabel
 echoproperties=org.apache.tools.ant.taskdefs.optional.EchoProperties
 splash=org.apache.tools.ant.taskdefs.optional.splash.SplashTask
 serverdeploy=org.apache.tools.ant.taskdefs.optional.j2ee.ServerDeploy
+jarlib-display=org.apache.tools.ant.taskdefs.optional.extension.JarLibDisplayTask
 
 # deprecated ant tasks (kept for back compatibility)
 starteam=org.apache.tools.ant.taskdefs.optional.scm.AntStarTeamCheckOut