##### SUMMARY
The documentation of the module *user* / parameter *shell* states:

https://github.com/ansible/ansible/blob/8edad83ae029d7838a6d6347576d2ddbcce12ad0/lib/ansible/modules/system/user.py#L79

But there are no (shell specific) notes.
##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
user / docs

##### ANSIBLE VERSION
devel branch

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
N/A

##### ADDITIONAL INFORMATION
Either remove the sentence or provide some information in the notes section.

cmd.append(self.skeleton)
        else:
            cmd.append('-M')
        if self.system:
            cmd.append('-r')
        cmd.append(self.name)
        (rc, err, out) = self.execute_command(cmd)
        if not self.local or rc != 0:
            return (rc, err, out)
        if self.expires is not None:
            if self.expires < time.gmtime(0):
                lexpires = -1
            else:
                
                lexpires = int(math.floor(self.module.params['expires'])) // 86400
            (rc, _err, _out) = self.execute_command([lchage_cmd, '-E', to_native(lexpires), self.name])
            out += _out
            err += _err
            if rc != 0:
                return (rc, out, err)
        if self.groups is None or len(self.groups) == 0:
            return (rc, err, out)
        for add_group in groups:
            (rc, _err, _out) = self.execute_command([lgroupmod_cmd, '-M', self.name, add_group])
            out += _out
            err += _err
            if rc != 0:
                return (rc, out, err)
        return (rc, out, err)
    def _check_usermod_append(self):