Automatic tip of 10% added for 3 or more people

Had delicious supper at Haiku. Service was average. I had to ask twice for a drink I ordered. Waited about 10 minutes for the drink although the restaurant was not even 20% occupied. When the three of us received the bill a tip of 10% had been added. Although I always tip 10% or more I do not think this is acceptable practice as it was not pointed out to us and should only apply to large tables. <br> <br>