add a copyright note about UB patches
diff --git a/include/libsais.h b/include/libsais.h
index d4a2d80..47f5373 100644
--- a/include/libsais.h
+++ b/include/libsais.h
@@ -19,6 +19,12 @@ longest common prefix array and burrows wheeler transform construction.
Please see the file LICENSE for full copyright information.
+The stability patches that fix undefined behaviour in unbwt routines:
+
+ Copyright (c) 2022 Kamila Szewczyk <kspalaiologos@gmail.com>
+
+ Licensed under the same license as the original software.
+
--*/
#ifndef LIBSAIS_H
