using Module apt: only_upgrade is wrong

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Hello,

Having either apt: only_upgrade=docker-engine in my playbook or running it on the command line as ansible all --sudo -m apt -a ‘only_upgrade=docker-engine’ fails with

xx.xxx.xx.xxx | FAILED! => {
"changed": false,
"failed": true,
"msg": "Boolean docker-engine not in either boolean list"
}

In the document

only_upgrade(added in 2.1)
Only install/upgrade a package if it is already installed.

my local ansible version is

ansible 2.1.0.0
config file = /etc/ansible/ansible.cfg
configured module search path = ['/usr/share/ansible']

and my host docker-engine version is 1.11.0,

Using only_upgrade way is wrong?

Thanks!