Bug: Does a TM (trademark), SM (service mark), (R) (registered trademark) symbol in a company's logo need alt text?

Input on this bug appreciated.

Can you please document in the HTML 5 spec if a logo (that happens to havea
> (R) registered trademark symbol) must have alt text that indicates that
> symbol. (I would also suggest documenting this for TM and SM as well.
>

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25965
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Regards

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