src/share/classes/javax/lang/model/util/SimpleTypeVisitor6.java

*** 116,125 ****
--- 116,129 ----
  
      /**
       * 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;
      }