Place the clause inside the parentheses at the end of a sentence.
Determine whether the passage inside the parentheses is a complete sentence or a fragment. A complete sentence contains a subject, a predicate (a verb) and it expresses a complete thought. For example, "The boy jumped over the ball" is a complete sentence because "the boy" is the subject and "jumped over the ball" is the predicate and it expresses a complete thought. The passage, "after I curl my hair" is not a complete sentence because although it contains a subject and a verb, it does not express a complete thought.
Place ending punctuation (period, question mark or exclamation point) inside the end parenthesis only if the passage inside the parentheses is a complete thought. For example, this sentence requires punctuation inside the end parenthesis because the passage inside parentheses is a complete sentence, "I was late for work. (I made up the time by staying late.)"
Add ending punctuation outside the end parenthesis if the passage inside the parentheses is a fragment. For example, this sentence does not require ending punctuation inside the parenthesis because the passage is a fragment: "We are going to the zoo today (by bus)."