The only mention is within the "Packetfilter HOWTO" at the chapter "7.3 
Filtering specification".
See 
http://iptables.netfilter.org/documentation/HOWTO/packet-filtering-HOWTO-7.html 

Quote:

> iptables is extensible, meaning that both the kernel and the iptables
tool can be extended to provide new features.

and

> The TCP extensions are automatically loaded if `-p tcp' is specified.

Those are "standard extensions" that get loaded automatically.
Maybe I am wrong, but those options should be into the man page!

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https://bugs.launchpad.net/bugs/1700949

Title:
  manpage is incomplete

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