Okay, so after my smartassed comment, I actually went and checked the service manual.
Technical data Coolant, total capacity 1.65 l
Remove cap (2) and slowly pour in coolant until the level reaches the edge of the filler neck (arrow).
Open bleed screw (3).
Close bleed screw (3) when the escaping coolant is free of bubbles.
Top up with coolant until the level reaches the edge of the filler neck (arrow). Install filler cap (2).
Top up the expansion tank to the MAX mark. Install cap (1).