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Many states recognize the validity of such a signed instrument.
Some require it to be in existence at the time the will is signed. In those states, TPPMs are similar to precatory gifts in your will or trust. If you don't direct that a certain asset go to a certain beneficiary, but merely express a hope, wish, or recommendation that the asset be given, most courts would hold that the language creates a moral obligation but not a legal obligation. Attach the new TPPM and make sure it's kept where it will be found after your death. If you have incorporated the TPPM in your will by reference, many states require you to amend the will to incorporate the amended document.