I know when you uncheck the "Notify customer" the customer dont get any emails.

I have created a test customer and because of the updates and notes i need to write sometimes in the comment about the customer (what has been done etc), sometimes i dont want to inform the customer about this.

Unchecking the "Notify customer" dont send email to him, but the comments are however posted.

How can i do it that whenever i uncheck the "notify customer" the comments are not posted on his order and that he also dont get mail?