diff --git a/src/extra/nnue_data_binpack_format.h b/src/extra/nnue_data_binpack_format.h
index 9b7a868e..5dd5819c 100644
--- a/src/extra/nnue_data_binpack_format.h
+++ b/src/extra/nnue_data_binpack_format.h
@@ -1,3 +1,29 @@
+/*
+
+Copyright 2020 Tomasz Sobczyk
+
+Permission is hereby granted, free of charge,
+to any person obtaining a copy of this software
+and associated documentation files (the "Software"),
+to deal in the Software without restriction,
+including without limitation the rights to use, copy,
+modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall
+be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
+THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
 #pragma once
 
 #include <cstdio>