##### 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.

else:
                groups = self.get_groups_set()
                group_diff = set(current_groups).symmetric_difference(groups)
                if group_diff:
                    if self.append:
                        for g in groups:
                            if g in group_diff:
                                groups = set(current_groups).union(groups)
                                groups_need_mod = True
                                break
                    else:
                        groups_need_mod = True
            if groups_need_mod:
                if len(groups) > 16:
                    self.module.fail_json(msg="Too many groups (%d) NetBSD allows for 16 max." % len(groups))
                cmd.append('-G')
                cmd.append(','.join(groups))
        if self.comment is not None and info[4] != self.comment:
            cmd.append('-c')
            cmd.append(self.comment)
        if self.home is not None and info[5] != self.home:
            if self.move_home:
                cmd.append('-m')
            cmd.append('-d')
            cmd.append(self.home)
        if self.shell is not None and info[6] != self.shell:
            cmd.append('-s')
            cmd.append(self.shell)
        if self.login_class is not None:
            cmd.append('-L')