diff --git a/modules/attach-license-header.py b/modules/attach-license-header.py
new file mode 100644
index 0000000..43e12b3
--- /dev/null
+++ b/modules/attach-license-header.py
@@ -0,0 +1,13 @@
+import glob
+
+license_text = '''# (c) https://github.com/coderefinery/autocmake/blob/master/AUTHORS.md
+# licensed under BSD-3: https://github.com/coderefinery/autocmake/blob/master/LICENSE
+
+'''
+
+for filename in glob.iglob('**/*.cmake', recursive=True):
+    with open(filename, 'r') as old:
+        text = old.read()
+    with open(filename, 'w') as new:
+        new.write(license_text)
+        new.write(text)