This excerpt taken from the CVS 8-K filed Aug 15, 2006.
. Notation On or Exchange of Debt Securities. If an amendment or supplement changes the terms of a Debt Security of any series, the Trustee may require the Holder of such Debt Security to deliver such Debt Security to the Trustee. The Trustee may place an appropriate notation on the Debt Security regarding the changed terms and return it to the Holder of such Debt Security. Alternatively, if the Company or the Trustee so determines, the Company in exchange for such Debt Security shall issue and the Trustee shall authenticate a new Debt Security that reflects such changed terms. Failure to make the appropriate notation or to issue a new Debt Security shall not affect the validity of such amendment or supplement.