Formalizing

They signed the treaty, formalizing the agreement between the two countries.

Now this was the custom in former time in Israel concerning redeeming and concerning exchanging, to confirm all things: a man took off his sandal, and gave it to his neighbor; and this was the way of formalizing transactions in Israel. So the near kinsman said to Boaz, "Buy it for yourself," then he took off his sandal.

Formalizing our agreement in writing is a necessary next step.