That does not seem to be the consensus. Rather, McDonald's is its own possessive. See <a href="http://english.stackexchange.com/questions/2933/possessive-of-a-word-thats-already-possessive">http://english.stackexchange.com/questions/2933/possessive-of-a-word-thats-already-possessive</a><br>

<br><div class="gmail_quote">On Sat, Mar 5, 2011 at 5:56 AM, Elizabeth Dodd <span dir="ltr"><<a href="mailto:edodd@billiau.net">edodd@billiau.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

On Fri, 04 Mar 2011 23:14:53 +0000<br>
<div class="im">"Dave F." <<a href="mailto:davefox@madasafish.com">davefox@madasafish.com</a>> wrote:<br>
<br>
</div><div class="im">> The name of the company is McDonalds, so anything belonging to them<br>
> should be McDonalds's.<br>
<br>
</div>The correct grammar for that would be McDonalds'<br>
<div><div></div><div class="h5"><br>
<br>
_______________________________________________<br>
talk mailing list<br>
<a href="mailto:talk@openstreetmap.org">talk@openstreetmap.org</a><br>
<a href="http://lists.openstreetmap.org/listinfo/talk" target="_blank">http://lists.openstreetmap.org/listinfo/talk</a><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>Martijn van Exel<br><a href="http://about.me/mvexel" target="_blank">http://about.me/mvexel</a><br>