Does the addition of words “addition” to a contract between the parties affect the contract?

It does not seem to me that it can be successfully contended that the addition of the words complained of in the document in question in the present action do not affect, and materially affect, the contract between the parties. It contained a promise to pay interest after maturity at a rate greater, at any rate, than the maker of the note would have been compelled to pay had these words not been put in, and had, in my opinion, a material alteration. The effect of such an alteration, in view of what is held in Suffell v. Bank of England, supra, and in the various authorities referred to therein—to quote the words of Jessel, M.R. above—“avoids it because it thereby ceases to be the same instrument.”