`-u`/`update-head-ok` unsupported on pull

From: Victor Engmark <victor.engmark@gmail.com>
Date: Oct 8, 2015, 17:27 UTC
Message-ID: <CAA5Ydx9ySzEBWcUkmGQKTq93W0HzfEmb3ER7GPKzcnQJ0dbFKw@mail.gmail.com>

According to the documentation these options are supported:
$ git help pull | grep -e '--update-head-ok'
       -u, --update-head-ok

However: $ git pull --update-head-ok error: unknown option `update-head-ok'

Using: $ git --version git version 2.6.1 $ pacman --query --info git | grep ^Version Version : 2.6.1-1

Am I missing something? The manual seems to be for the right version:

$ git help pull | tail -n1 | tr -s ' ' Git 2.6.1 10/06/2015 GIT-PULL(1)

I'm running the system installed Git:

$ type -a git git is /usr/bin/git

Cheers Victor