This section is from the book "The Law Of Contracts", by William Herbert Page. Also available from Amazon: Commercial Contracts: A Practical Guide to Deals, Contracts, Agreements and Promises.
Other changes in written contracts which modify the legal effect thereof may he material alterations. Thus a waiver of exemptions written over a blank indorsement,1 adding "protest waived" to an indorsement,2 or striking out a provision for the payment of attorneys' fees for collection in case of default,3 or striking out a condition so as to leave the promise absolute,4 or adding "with difference of exchange,"5 are all material alterations. The addition of a word, such as "his," 6 which may make the subject-matter specific instead of general, is a material alteration. An interlineation in a note to the effect that a vendor's lien is reserved on the land for which the note is given is not an immaterial alteration as a matter of law, since the deed may have waived the lien.7