diff --git a/src/link/script.y b/src/link/script.y
index 2155b6d4..9cb4dad4 100644
--- a/src/link/script.y
+++ b/src/link/script.y
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: MIT */
+
 %language "c++"
 %define api.value.type variant
 %define api.token.constructor