Grass clippings are a fantastic activator for your compost and adding a little of this will help get things going quickly.
It is really important to not get carried away and add too much grass. Grass on it’s own will compact down, excluding oxygen from the decomposition process and turn into a dark, smelly slime. To avoid this, add grass in moderation, and ideally try to let it dry out a bit before adding to the composter. If you think you have added too much grass, add more ‘brown’ material as soon as possible and give it a good mix through.