diff --git a/gen/gen_cid/__init__.py b/gen/gen_cid/__init__.py
index d65c10e..3ca27e7 100644
--- a/gen/gen_cid/__init__.py
+++ b/gen/gen_cid/__init__.py
@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
+# This file is under GNU Affero General Public License 3.0
+# see LICENSE.txt
 
 from . import c_2_ast
 from . import ast_2_cid
diff --git a/gen/gen_cid/ast_2_cid.py b/gen/gen_cid/ast_2_cid.py
index 1f7776d..fb0383f 100755
--- a/gen/gen_cid/ast_2_cid.py
+++ b/gen/gen_cid/ast_2_cid.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
-import os
+# This file is under GNU Affero General Public License 3.0
+# see LICENSE.txt
 
 from . import utils
 
diff --git a/gen/gen_cid/c_2_ast.py b/gen/gen_cid/c_2_ast.py
index 3a18896..a9a6385 100644
--- a/gen/gen_cid/c_2_ast.py
+++ b/gen/gen_cid/c_2_ast.py
@@ -1,4 +1,7 @@
 # -*- coding: utf-8 -*-
+# This file is under GNU Affero General Public License 3.0
+# see LICENSE.txt
+
 import clang.cindex
 from clang.cindex import CursorKind
 
diff --git a/gen/gen_cid/cid_2_yml.py b/gen/gen_cid/cid_2_yml.py
index 83b0355..3d92bd5 100644
--- a/gen/gen_cid/cid_2_yml.py
+++ b/gen/gen_cid/cid_2_yml.py
@@ -1,4 +1,7 @@
 # -*- coding: utf-8 -*-
+# This file is under GNU Affero General Public License 3.0
+# see LICENSE.txt
+
 from . import utils
 
 
diff --git a/gen/gen_cid/gen_yml.py b/gen/gen_cid/gen_yml.py
index 5cee982..a71c1aa 100755
--- a/gen/gen_cid/gen_yml.py
+++ b/gen/gen_cid/gen_yml.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+# This file is under GNU Affero General Public License 3.0
+# see LICENSE.txt
 
 import sys
 import json
diff --git a/gen/gen_cid/utils.py b/gen/gen_cid/utils.py
index 385fd33..ccaa463 100644
--- a/gen/gen_cid/utils.py
+++ b/gen/gen_cid/utils.py
@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
-#
+# This file is under GNU Affero General Public License 3.0
+# see LICENSE.txt
+
 import os
 import json