Every tutorial for org-mode says that when you mark a TODO item DONE, it should add a line like
CLOSED:[2017-08-06 Sun 12:00]
When I mark something DONE, no such line appears. I first observed this with my heavily configured emacs, and then I went and loaded up emacs with -no-init-file and went straight into org-mode, and the behavior is the same (I still don't get the CLOSED line). Is there some option to enable to disable this somewhere? The guides online seem to suggest it should happen by default without my doing anything.
I'm using org 8.2.10 on emacs 25.2.