PEP 20 - Silly Question?

[Joseph Armbruster]

I have used Python for some time and ran a windows build-bot for a bit.
 This morning, I told a fellow developer "There should be only one obvious
way to do it." and then I proceeded to forward him to the Zen of Python and
sent him a link to:
http://www.python.org/dev/peps/pep-0020/

I noticed that it says only 19 of 20 have been written down.  Which one was
not written down?

Thank You,
Joseph Armbruster
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