indicating subtitles using small

a recent discussion drew attention to the use of <small> inside a hx
element to indicate a subtitle

example:

<h1>The reality dysfunction:
<small>Space is not the only void</small>
</h1>

while it contradicts the current definition of small in HTML5. in HTM 4.01
<small> only had a visual style meaning of "small text"

what are peoples thoughts on extending <small> to identify
subheadings/subtitles taglines etc when used as a descendant of a hx
element?



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Regards

SteveF
HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>