Question about plea deals

[Douglas Lucas]

Lawyers tell me that most/all plea deals have a boilerplate paragraph
stating that what isn't written in the plea deal doesn't count.

For example in alleged WikiLeaks courier Matt DeHart's plea deal --
http://douglaslucas.com/files/DeHart_PleaAgreement.pdf -- on PDF page 13
there's this text: "29. No promises, agreements, or conditions have been
entered into other than those set forth in this Plea Agreement, and none
will be entered into unless memorialized in writing and signed by all of
the parties listed below."

Does anyone know what the generic term/name is for that kind of
paragraph in a contract (preferably, in a plea deal specifically)?

I ask the lawyers and they say there is such a generic term and they
just can't remember.