An acknowledgment is one of the most common types of notarial acts, but it often confuses Notaries. Here are 5 steps to performing an acknowledgment.The certificate of acknowledgment (PDF) must be in the form set forth in California Civil Code section 1189. How do you fill out an acknowledgment letter? To do this, refer to the exhibit in the document, assign it a letter or number, and then attach it with a label using that letter or number.