I have just this minute finished re-reading the Schematism in the First Critique. The Schematism is a very problematic passage. It ought not to exist, given the argument of the Deduction, but for a variety of reasons it does [this would take too long to explain in a casual blog post.] Nevertheless, Kant, being Kant, manages to put some extremely important material into the chapter, about which I shall have to lecture at some length.
In the very last paragraph, several sentences before the end, Kemp Smith [the translator of the edition I am using] has an editorial footnote to the words "a concept." It reads, "[Altered by Kant (Nachtrage lxi) to eine Erkenntnis.]" The Nachtrage are papers left by Kant at his death which have been assembled, commented upon, published, and made much of by generations of German Kant scholars. [By the way, I cannot put in umlauts in my blog facility. Sorry about that.]
I am embarrassed to confess that I had never noticed the footnote before. A very great deal is wrapped up in Kant's little emendation. Indeed, from this one editorial alteration, I could [and will in my lectures] unpack the entire problematic and ultimately unsustainable relationship between Kant's theoretical philosophy and his moral philosophy, a subject of the greatest importance for Moral Philosophy in the past two centuries.
On to the Axioms of Intuition!