This is “Parentheses”, section 3.6 from the book Successful Writing (v. 1.0).
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Parentheses ( )Punctuation marks that are used in pairs to contain information that is secondary to the meaning of a sentence. are punctuation marks that are always used in pairs and contain material that is secondary to the meaning of a sentence. Parentheses must never contain the subject or verb of a sentence. A sentence should make sense if you delete any text within parentheses and the parentheses.
Attack of the Killer Potatoes has to be the worst movie I have seen (so far).
Your spinach and garlic salad is one of the most delicious (and nutritious) foods I have ever tasted!
On your own sheet of paper, clarify the following sentences by adding parentheses. If the sentence is clear as it is, write OK.