diff --git a/cli-options_test.go b/cli-options_test.go
index b49592c..0e0ad36 100644
--- a/cli-options_test.go
+++ b/cli-options_test.go
@@ -1,3 +1,8 @@
+// Copyright (c) 2025 David Vogel
+//
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
 package typst_test
 
 import (
diff --git a/image_test.go b/image_test.go
index 03c2240..1a35826 100644
--- a/image_test.go
+++ b/image_test.go
@@ -1,3 +1,8 @@
+// Copyright (c) 2025 David Vogel
+//
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
 package typst_test
 
 import (
diff --git a/readme_test.go b/readme_test.go
index c5dd754..0ae4480 100644
--- a/readme_test.go
+++ b/readme_test.go
@@ -1,3 +1,8 @@
+// Copyright (c) 2025 David Vogel
+//
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
 package typst_test
 
 import (
diff --git a/util_test.go b/util_test.go
index c046d6c..a62960f 100644
--- a/util_test.go
+++ b/util_test.go
@@ -1,3 +1,8 @@
+// Copyright (c) 2025 David Vogel
+//
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
 package typst
 
 import (