diff --git a/src/translation.rs b/src/translation.rs
index 92dac0a..d8464b8 100644
--- a/src/translation.rs
+++ b/src/translation.rs
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2023 Louis Hollingworth <louis@hollingworth.nl>
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 type FluentBundle = fluent::bundle::FluentBundle<
     fluent::FluentResource,
diff --git a/translations/en-US.ftl b/translations/en-US.ftl
index 16db484..747f751 100644
--- a/translations/en-US.ftl
+++ b/translations/en-US.ftl
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2023 Louis Hollingworth <louis@hollingworth.nl>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 # Command metadata
 threads = threads
     .description = Displays current active threads