diff -r 1eb09dba594a -r b7a10bc02e7a src/share/classes/javax/lang/model/util/SimpleTypeVisitor6.java
--- a/src/share/classes/javax/lang/model/util/SimpleTypeVisitor6.java	Sun Jun 16 22:38:04 2013 -0700
+++ b/src/share/classes/javax/lang/model/util/SimpleTypeVisitor6.java	Mon Jun 17 14:46:01 2013 -0700
@@ -118,6 +118,10 @@
      * The default action for visit methods.  The implementation in
      * this class just returns {@link #DEFAULT_VALUE}; subclasses will
      * commonly override this method.
+     *
+     * @param e the type to process
+     * @param p a visitor-specified parameter
+     * @return {@code DEFAULT_VALUE} unless overridden
      */
     protected R defaultAction(TypeMirror e, P p) {
         return DEFAULT_VALUE;