on Just Publishing Advice:
When do you use a comma before which?
The answer is easy.
Yes. You use a comma when the word which introduces a nonrestrictive phrase, which is also called a non-defining clause.
No. You don’t add a comma when which comes before a restrictive or defining clause.
No. There is no comma when which forms an indirect or direct question or is part of a prepositional phrase.
In This Article
Explaining the comma before which
When you don’t use a comma with which
No comma with prepositional phrases
Which in questions
Summary of the rules
Chris The Story Reading Ape's Blog 
Reblogged this on wordrefiner.
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dear me.. so many rules (lol)
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