is 0, the archive comment will be removed.
    <var class="Ar">comment</var> must be encoded in ASCII or UTF-8.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
  VALUES</a></h1>
<p class="Pp">Upon successful completion 0 is returned. Otherwise, -1 is
    returned and the error information in <var class="Ar">archive</var> is set
    to indicate the error.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="ERRORS"><a class="permalink"