def comment_lines_ocaml(text, start='(* ', end=' *)'):
    """
    Build an OCaml comment line from input text.

    Parameters
    ----------
    text : str
        Text to comment out.
    start : str
        Character to open the multi-line comment.
    end : str
        Character to close the multi-line comment.
    """
    return start + ('\n').join(text.split('\n')) + end