diff --git a/include/boost/unordered/detail/static_assert.hpp b/include/boost/unordered/detail/static_assert.hpp
index 2e91dbe7..4e877b12 100644
--- a/include/boost/unordered/detail/static_assert.hpp
+++ b/include/boost/unordered/detail/static_assert.hpp
@@ -1,3 +1,7 @@
+// Copyright 2023 Christian Mazakas
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
 #ifndef BOOST_UNORDERED_DETAIL_STATIC_ASSERT_HPP
 #define BOOST_UNORDERED_DETAIL_STATIC_ASSERT_HPP
 
@@ -9,4 +13,4 @@
 #define BOOST_UNORDERED_STATIC_ASSERT(...)                                     \
   static_assert(__VA_ARGS__, #__VA_ARGS__)
 
-#endif // BOOST_UNORDERED_DETAIL_STATIC_ASSERT_HPP
\ No newline at end of file
+#endif // BOOST_UNORDERED_DETAIL_STATIC_ASSERT_HPP