“A new phase of friendship and cooperation, said Pope Francis, on welcoming the adherence of the World Communion of Reformed Churches (WCRC) to the ecumenical consensus on the Doctrine of Justification, on July 5, 2017 at Wittenberg in Germany, where Luther’s Reformation began in 1517.
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Monsignor Brian Farrell, Secretary of the Pontifical Council for Promoting Christian Unity, represented the Catholic Church at the signing. He read a message of Pope Francis who welcomed it as “an eloquent sign of our commitment to continue together, as brothers and sisters in Christ, on the path from conflict to communion, from division to reconciliation.”
Source: Pope Francis - Quoted by Anne Kurian in "Pope Welcomes Adherence of the Reformed Churches to the Declaration on Justification", Zenit, 14 July 2017, https://zenit.org/articles/pope-welcomes-adherence-of-the-reformed-churches-to-the-declaration-on-justification/