code: protected void processOverview() {
          if ( options.getOverviewFile() != null ) {
              try {
                  rootDoc.setRawCommentText(Files.toString(options.getOverviewFile(), options.getEncoding()));
                  defaultProcess(rootDoc, false);
              }
              catch ( IOException e ) {
                  printError("Error loading overview from " + options.getOverviewFile() + ": " + e.getLocalizedMessage());
                  rootDoc.setRawCommentText("");
              }
          }
      }
docs: Process the overview file, if specified.