diff --git a/apps/emqx_utils/src/emqx_utils_binary.erl b/apps/emqx_utils/src/emqx_utils_binary.erl
index d9e504f46..26976496d 100644
--- a/apps/emqx_utils/src/emqx_utils_binary.erl
+++ b/apps/emqx_utils/src/emqx_utils_binary.erl
@@ -1,4 +1,6 @@
 %%--------------------------------------------------------------------
+%% Original file taken from https://github.com/arcusfelis/binary2
+%% Copyright (c) 2016 Michael Uvarov
 %% Copyright (c) 2020-2023 EMQ Technologies Co., Ltd. All Rights Reserved.
 %%
 %% Licensed under the Apache License, Version 2.0 (the "License");
@@ -16,8 +18,6 @@
 
 -module(emqx_utils_binary).
 
-%% copied from https://github.com/arcusfelis/binary2
-
 %% Bytes
 -export([
     reverse/1,
diff --git a/apps/emqx_utils/test/emqx_utils_binary_tests.erl b/apps/emqx_utils/test/emqx_utils_binary_tests.erl
index 514e0874a..3709fb014 100644
--- a/apps/emqx_utils/test/emqx_utils_binary_tests.erl
+++ b/apps/emqx_utils/test/emqx_utils_binary_tests.erl
@@ -1,3 +1,8 @@
+%%--------------------------------------------------------------------
+%% Original file taken from https://github.com/arcusfelis/binary2
+%% Copyright (c) 2016 Michael Uvarov
+%% Copyright (c) 2023 EMQ Technologies Co., Ltd. All Rights Reserved.
+%%
 -module(emqx_utils_binary_tests).
 
 -import(emqx_utils_binary, [