punctuation - Comma before which


I'm not sure which of the following sentences is correct. Is the comma mandatory, optional or unnecessary? I've googled a bit about this topic, but I got confused.



Our mapping contains 2000 words, which map to more than one lemma.



or



Our mapping contains 2000 words which map to more than one lemma.



Context: In total, there are more than 2000 words.


I've read Is it appropriate to put a comma before "which"? . If I understand the answers correctly, my "which map to more than one lemma" is a defining clause and no comma is required. But is it wrong to add one?




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