UCC 9-204(a) says that "a security agreement may create or provide for a security interest in after-acquired collateral" (emphasis added).  In cases where the secured party claims that the parties contemplated a security interest in after-acquired collateral even though an authenticated agreement between them failed to include an explicit term to that effect, some courts have rescued the errant drafter by reading such a clause into the security agreement.  Other courts have refused to do so.  As counsel to a secured party, it is best not to take the chance.