diff --git a/include/asm/warning.h b/include/asm/warning.h
index 3f26618d..49715fb6 100644
--- a/include/asm/warning.h
+++ b/include/asm/warning.h
@@ -1,3 +1,11 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
 #ifndef WARNING_H
 #define WARNING_H
 
diff --git a/src/asm/warning.c b/src/asm/warning.c
index 2a55d98d..a5db5642 100644
--- a/src/asm/warning.c
+++ b/src/asm/warning.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <limits.h>
 #include <stdarg.h>
diff --git a/src/hashmap.c b/src/hashmap.c
index 4ad2c129..cb3c27e5 100644
--- a/src/hashmap.c
+++ b/src/hashmap.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdint.h>
 #include <stdbool.h>
diff --git a/src/link/assign.c b/src/link/assign.c
index 524de74f..40f7d1f0 100644
--- a/src/link/assign.c
+++ b/src/link/assign.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdbool.h>
 #include <stdlib.h>
diff --git a/src/link/object.c b/src/link/object.c
index 64f3adc0..a185958c 100644
--- a/src/link/object.c
+++ b/src/link/object.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdio.h>
 #include <stdint.h>
diff --git a/src/link/output.c b/src/link/output.c
index 4d797fdc..801bab15 100644
--- a/src/link/output.c
+++ b/src/link/output.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdlib.h>
 #include <stdint.h>
diff --git a/src/link/patch.c b/src/link/patch.c
index 7856e947..e70f1f89 100644
--- a/src/link/patch.c
+++ b/src/link/patch.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdlib.h>
 #include <limits.h>
diff --git a/src/link/script.c b/src/link/script.c
index bd1d1098..368f52e3 100644
--- a/src/link/script.c
+++ b/src/link/script.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdlib.h>
 #include <stdbool.h>
diff --git a/src/link/section.c b/src/link/section.c
index 1cbdb541..8a83d74b 100644
--- a/src/link/section.c
+++ b/src/link/section.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdbool.h>
 
diff --git a/src/link/symbol.c b/src/link/symbol.c
index 3d3232fb..5bda0fd9 100644
--- a/src/link/symbol.c
+++ b/src/link/symbol.c
@@ -1,3 +1,10 @@
+/*
+ * This file is part of RGBDS.
+ *
+ * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
+ *
+ * SPDX-License-Identifier: MIT
+ */
 
 #include <stdbool.h>