The United States and Iran on Sunday announced that they’ve agreed to a preliminary deal to end the monthslong war that has killed thousands and wreaked havoc on the global economy. It marks a positive step forward in a peace process that’s been stalled for weeks, but many details remain unknown, as the text of the agreement has not been released. The two sides are expected to hold a signing ceremony for the deal on Friday.

Here’s more on what we know and don’t know about the interim deal, which has been described by Iran as a memorandum of understanding, and what could happen next.

The United States and Iran on Sunday announced that they’ve agreed to a preliminary deal to end the monthslong war that has killed thousands and wreaked havoc on the global economy. It marks a positive step forward in a peace process that’s been stalled for weeks, but many details remain unknown, as the text of the agreement has not been released. The two sides are expected to hold a signing ceremony for the deal on Friday.

Here’s more on what we know and don’t know about the interim deal, which has been described by Iran as a memorandum of understanding, and what could happen next.

A path to more talks. The agreement provides a framework for ending the war and is primarily designed to halt military operations, prolong the existing truce, and end the stalemate over the Strait of Hormuz. Reopening the strategic waterway in particular is a key goal for U.S. President Donald Trump, who has faced growing domestic criticism over high gas prices and other economic impacts caused by the war.