diff --git a/README.md b/README.md
index feac42a9d91d58e677cca2d7a23057ee3c261fac..745e4ffa666bd504146cee37fccc9ed567f6ed6f 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ enter the URL to this Git project.
 You can also call this:
 ```bash
 flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
-flatpak-builder builddir --install-deps-from=flathub --user --install --force-clean --ccache app.briar.gtk.yaml
+flatpak-builder builddir --install-deps-from=flathub --user --install --force-clean --ccache app.briar.gtk.json
 flatpak run app.briar.gtk
 ```