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When TODO keywords are used as workflow states (see Workflow states), you might want to keep track of when a state change occurred, and you may even want to attach notes to that state change. With the setting
(setq org-log-done '(state))
each state change will prompt you for a note that will be attached to the current headline. Very likely you do not want this verbose tracking all the time, so it is probably better to configure this behavior with in-buffer options. For example, if you are tracking purchases, put these into a separate file that starts with:
#+SEQ_TODO: TODO ORDERED INVOICE PAYED RECEIVED SENT
#+STARTUP: lognotestate