diff --git a/custom_mutators/autotokens/autotokens.cpp b/custom_mutators/autotokens/autotokens.cpp
index 4a2cc08f..0a010f0b 100644
--- a/custom_mutators/autotokens/autotokens.cpp
+++ b/custom_mutators/autotokens/autotokens.cpp
@@ -1,3 +1,9 @@
+/*
+   token level fuzzing custom mutator for afl++
+   (c) by Marc Heuse <mh@mh-sec.de>
+   License: Apache 2.0
+*/
+
 extern "C" {
 
 #include "afl-fuzz.h"