def _add_html_tag(text: str, tag:str) -> str:
    """ 
    Annotates a text with HTML tags. 

    Args: 
        text (:obj:`str`): 
            Text to be processed.
        tag (:obj:`str`): 
            Tag to add to text.

    Returns:
        :obj:`str`: 
            The text annotated with HTML tags.
    """

    return f'<{tag}>{text}</{tag}>'