diff --git a/graphics/gr/thinking/combo.s b/graphics/gr/thinking/combo.s
index cddb88ca..d2211d8a 100644
--- a/graphics/gr/thinking/combo.s
+++ b/graphics/gr/thinking/combo.s
@@ -1,3 +1,5 @@
+; SPDX-License-Identifier: MIT
+
 ; Print-shop Style THINKING/CRACKING demo
 
 ; without pageflip
diff --git a/graphics/gr/thinking/thinking.s b/graphics/gr/thinking/thinking.s
index cbe79a68..24bb3164 100644
--- a/graphics/gr/thinking/thinking.s
+++ b/graphics/gr/thinking/thinking.s
@@ -1,3 +1,5 @@
+; SPDX-License-Identifier: MIT
+
 ; Print-shop Style THINKING
 
 ; without pageflip