How enable IPv6 module in LTM

Thank you,

so if I see "ADD IPV6 GATEWAY" into License Configuration, Do I need to purchase or only enable it ?

Active Modules in my F5:

Local Traffic Manager, 3600(Perpetual) () Local Traffic Manager Module ADD IPV6 GATEWAY ADD RATE SHAPING ADD RAMCACHE 50 MBPS COMPRESSION SSL 500 TPS Per Core ADD SSL CMP ADD ANTI-VIRUS CHECKS ADD BASE ENDPOINT SECURITY CHECKS ADD FIREWALL CHECKS ADD NETWORK ACCESS ADD SECURE VIRTUAL KEYBOARD ADD WEB APP ADD MACHINE CERTIFICATE CHECKS ADD PROTECTED WORKSPACE