Parentheses (these: ( )) are used to add extra information in a sentence. But where does the punctuation go: inside or outside? Here are the rules.
When the sentence inside the parentheses is complete and stands on its own, the period goes inside.
If the words in parentheses are just a part of the full sentence, the period goes outside.
They go inside the parentheses if they belong only to the words inside. The main sentence still ends with its own period.
Don’t place a comma before parentheses, but placing one after is fine if the sentence needs it.
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