--- old/src/share/vm/runtime/arguments.cpp	Mon Aug 30 03:51:10 2010
+++ new/src/share/vm/runtime/arguments.cpp	Mon Aug 30 03:51:08 2010
@@ -2830,6 +2830,13 @@
       CommandLineFlags::printFlags();
       vm_exit(0);
     }
+
+#ifndef PRODUCT
+    if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
+      CommandLineFlags::printFlags(true);
+      vm_exit(0);
+    }
+#endif
   }
 
   if (IgnoreUnrecognizedVMOptions) {