diff --git a/ansiblelater/rules/CheckFQCNBuiltin.py b/ansiblelater/rules/CheckFQCNBuiltin.py
index b31f8fd..e232fbd 100644
--- a/ansiblelater/rules/CheckFQCNBuiltin.py
+++ b/ansiblelater/rules/CheckFQCNBuiltin.py
@@ -1,3 +1,5 @@
+# Original code written by the authors of ansible-lint
+
 from ansiblelater.rule import RuleBase
 from ansiblelater.utils import load_plugin