More on: Nafta negotiators working on a side deal for the pledge to avoid devaluing

Bloomberg cite "three people familiar with the matter" saying:

• Nafta negotiators are working on a side deal for the U.S., Canada and Mexico to make a non-binding pledge to avoid devaluing their currencies for competitive purposes

More:

• The currency pledge won't be brought into the main Nafta agreement
• Negotiators plan to make the deal non-binding to recognize the countries have floating currencies, and that their central banks rarely intervene in markets, the people said.

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Such an understanding is implicit across many international trade agreements, still it doesn't hut to reiterate.