code: @Override
      public void addNestedClassInfo(final Content classInfoTree) {
          Element outerClass = typeElement.getEnclosingElement();
          if (outerClass == null)
              return;
          new SimpleElementVisitor8<Void, Void>() {
              @Override
              public Void visitType(TypeElement e, Void p) {
                  Content label = utils.isInterface(e)
                          ? contents.enclosingInterfaceLabel
                          : contents.enclosingClassLabel;
                  Content dt = HtmlTree.DT(label);
                  Content dl = HtmlTree.DL(dt);
                  Content dd = new HtmlTree(HtmlTag.DD);
                  dd.addContent(getLink(new LinkInfoImpl(configuration,
                          LinkInfoImpl.Kind.CLASS, e)));
                  dl.addContent(dd);
                  classInfoTree.addContent(dl);
                  return null;
              }
          }.visit(outerClass);
      }
docs: {@inheritDoc}