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http://grammar.about.com/od/mo/g/nonrestricterm.htm
http://thekennedykorralblog.blogspot.com/2011/11/commas.html
The boy's shoulder dislocated, like his mother predicted, when he fell on his scooter.
The fact that his overprotective mother predicted the event to happen doesn't add any information that changes the sentence drastically, and must be in commas.
According to about.com:
"A word, phrase, or dependent clause that provides added (though not essential) information to a sentence but does not limit (or restrict) the element it modifies."
You know the information is truly nonrestrictive if you can delete it completely, and not have any confusion while reading.
You must enclose this information in commas!
I went down to the Dry Dock, in Leamy, to get some food.
The "in Leamy" doesn't add any necessary information that is needed to understand the sentence. Therefore it is nonrestrictive
commas