An Illinois notary acknowledgment form certifies the authenticity of signatures inscribed on a legal document. This article and video will show you the information you need to write in each part of the certificate wording, and common mistakes to avoid.An Illinois notary acknowledgment form is a written authentication from a notary that the signature on a document belongs to the signer. This instrument was acknowledged before me on ______(date) by. (name of person acknowledged.) (Seal). To fill out this form, gather the necessary personal information required for the acknowledgment. Acknowledgment (in a representative capacity):. To fill out this form, gather the necessary personal information required for the acknowledgment. Signer's Name: The document must clearly state the full name of the person whose signature is being acknowledged. Our Illinois Notary Acknowledgment Stamp is the perfect way to add the required wording to a document to make it Illinois compliant.