Does T-Mobile charge extra if you text to Canada (with unlimited texting)?

[ChrisEhninger]

http://support.t-mobile.com/doc/tm20120.xml?docid=724&referring%20topicid=122&A2L.SERVICE=Text%20Messaging&Referring%20TopicID/DocID%20List%20Index=y&navtypeid=2&pagetypeid=2&prevPageIndex=146

Says "US or Canada," so I assume it's okay if I have unlimited texting, but I'm really not too sure about it...