Samsung began rolling out Marshmallow to the South Korean Model of Samsung Galaxy S5(SM-G900L). Now The Global Variant(SM-G900F) of Samsung Galaxy S5 is Receiving Marshmallow in Sri Lanka. The Global Variant (SM-G900F) is same as the model sold in Europe, Latin America and Asia.
If you are in that Region be sure to Install the update. The Update will Bring all the Good Stuff of Marshmallow. You Phone must have notificated you. if you haven’t got the update Automatically. Check Manually by heading To Settings>About Phone>System Updates.