code: @Override
      @CheckReturnValue
      public MessageAction append(final char c)
      {
          if (content.length() == Message.MAX_CONTENT_LENGTH)
              throw new IllegalArgumentException("A message may not exceed 2000 characters. Please limit your input!");
          content.append(c);
          return this;
      }
docs: {@inheritDoc}
  @throws java.lang.IllegalArgumentException
  If the appended CharSequence is too big and will cause the content to
  exceed the {@value net.dv8tion.jda.core.entities.Message#MAX_CONTENT_LENGTH} character limit
  
  @return Updated MessageAction for chaining convenience