When Nick and Mrs. Granger debate the use of frindle in September, he makes it clear that he isn't going to stop using the word. In fact, he says that it is "fun" and that he has been able to demonstrate how "words really change." When Mrs. Granger realizes that he is not going to stop using the word, she tells him that she "thought it would end up this way" and pulls an envelope from her desk. Inside this envelope is a letter that she has already written to Nick, and she asks him to sign his name on it and date it so that one day when she gives it to him, he will know that it is the very same letter. Although Nick thinks this is "weird," he signs the envelope as asked. Nick keeps waiting for the letter that will indicate that their "battle" is over, but he never receives the signed envelope.

Ten years later, Nick receives a package containing a new Webster's College Dictionary with a note taped to its cover. It asks Nick to turn to page 541, where he finds the word frindle listed as an official entry. Also inside the package is the sealed envelope with Nick's signature on the back. Nick is finally able to read the letter Mrs. Granger had composed all those years ago.

She congratulates him on having the word frindle added to the dictionary and conveys her gratitude for being able to being able to watch it all play out. She acknowledges that every great story needs a villain, which is the role she chose to play in Nick's journey. She also conveys that one of her goals in education has always been to "teach children something that would be useful no matter what" in a world that is ever-changing. Nick realizes that his teacher had been cheering for him the entire time.