What headline has your documentation item ? You can use more than one headline level in your title. Each level is marked with a <h0> - <h9>-Tag (similar to HTML). Your title has to start with a <h0>-Tag and then following the lesser levels. Example:
<title>
<h0>Hardware</h0>
<h1>Disks</h1>
<h2>Mounted Filesystems</h2>
</title>