diff --git a/docker/Dockerfile.x86_64-unknown-linux-gnu b/docker/Dockerfile.x86_64-unknown-linux-gnu
index 119ff295de..3f458ff4cb 100644
--- a/docker/Dockerfile.x86_64-unknown-linux-gnu
+++ b/docker/Dockerfile.x86_64-unknown-linux-gnu
@@ -1,3 +1,6 @@
+# Copyright © SixtyFPS GmbH <info@slint-ui.com>
+# SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
+
 FROM rustembedded/cross:x86_64-unknown-linux-gnu
 # Unfortunately the base container is based on Centos7 rather than Ubuntu