Afterthought

n.	1.	Reflection after an act; later or subsequent thought.
	2.	an action taken after another action and related to the first action, which would normally or optimally be done along with the first action; - as, to do something as an afterthought.
	3.	a feature or part added to a device, not thought of in its original design.

Noun	1.	afterthought - thinking again about a choice previously made; "he had second thoughts about his purchase" Synonyms: rethink, second thought, reconsideration
	2.	afterthought - an addition that was not included in the original plan; "the garage was an afterthought"

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