User blog comment:Da Nerd/(1) I hate it when/@comment-27821571-20161018165424

It depends on how you use it.

"We invited the anime characters, Leonardo da Vinci, and William Shakespear."

It makes sense to go there, because without, it sounds like Leonardo da Vinci and William Shakespear are the anime characrers.

"We invited the singers, Beyoncè and Lady Gaga."

It makes sense without it there, because it implies the singers are Beyoncè and Lady Gaga.