code: public static void append(File file, Object text, boolean writeBom) throws IOException {
          append(file, text, Charset.defaultCharset().name(), writeBom);
      }
docs: Append the text at the end of the File.  If the default
  charset is "UTF-16BE" or "UTF-16LE" (or an equivalent alias) and
  <code>writeBom</code> is <code>true</code>, the requisite byte order
  mark is written to the file before the text.
  
  @param file     a File
  @param text     the text to append at the end of the File
  @param writeBom whether to write a BOM
  @throws IOException if an IOException occurs.
  @since 2.5.0