diff --git a/asteroids3D.keyring b/asteroids3D.keyring
new file mode 100644
index 0000000..5a8de51
--- /dev/null
+++ b/asteroids3D.keyring
@@ -0,0 +1,25 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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diff --git a/asteroids3D.spec b/asteroids3D.spec
index 6881806..448a95c 100644
--- a/asteroids3D.spec
+++ b/asteroids3D.spec
@@ -24,7 +24,9 @@ License:        GPL-2.0-or-later
 Group:          Amusements/Games/Action/Arcade
 URL:            https://inai.de/projects/asteroids3D
 
-Source:         %name-%version.tar.xz
+Source:         https://inai.de/files/asteroids3D/%name-%version.tar.xz
+Source2:        https://inai.de/files/asteroids3D/%name-%version.tar.asc
+Source3:        %name.keyring
 BuildRequires:  pkg-config >= 0.19
 BuildRequires:  xz
 BuildRequires:  pkgconfig(gl)