diff --git a/gpu/internal/rendertest/bench_test.go b/gpu/internal/rendertest/bench_test.go
index 3a3ddf94..b909c844 100644
--- a/gpu/internal/rendertest/bench_test.go
+++ b/gpu/internal/rendertest/bench_test.go
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
 package rendertest
 
 import (
diff --git a/gpu/internal/rendertest/clip_test.go b/gpu/internal/rendertest/clip_test.go
index c98839d4..6b97cfb6 100644
--- a/gpu/internal/rendertest/clip_test.go
+++ b/gpu/internal/rendertest/clip_test.go
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
 package rendertest
 
 import (
diff --git a/gpu/internal/rendertest/doc.go b/gpu/internal/rendertest/doc.go
index 9f6948e9..378f1fb1 100644
--- a/gpu/internal/rendertest/doc.go
+++ b/gpu/internal/rendertest/doc.go
@@ -1,2 +1,4 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
 // Package rendertest is intended for testing of drawing ops only.
 package rendertest
diff --git a/gpu/internal/rendertest/render_test.go b/gpu/internal/rendertest/render_test.go
index f4beeb58..06e7a3d9 100644
--- a/gpu/internal/rendertest/render_test.go
+++ b/gpu/internal/rendertest/render_test.go
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
 package rendertest
 
 import (
diff --git a/gpu/internal/rendertest/transform_test.go b/gpu/internal/rendertest/transform_test.go
index 43364b86..b37d7d3e 100644
--- a/gpu/internal/rendertest/transform_test.go
+++ b/gpu/internal/rendertest/transform_test.go
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
 package rendertest
 
 import (