max_connections required?

[landam]

When playing with ansible pg tune I got following error:

fatal: [gislab_vagrant]: FAILED! => {"changed": false, "failed": true,
"msg": "missing required arguments: max_connections"}

In documentation (1) is set max_connections param only for PG 9.1 (but, even in the vars, version 9.6 is mentioned). The ansible playbook was run against PG 9.5. It's not clear when max_connection is required (2).

(1) https://github.com/imincik/ansible-postgresql_tune#postgres-91-with-changes-to-kernel-shm-settings-and-setting-a-max_connections
(2) https://github.com/imincik/ansible-postgresql_tune#postgresql-96