diff --git a/include/armadillo_bits/config.hpp.cmake b/include/armadillo_bits/config.hpp.cmake
index 3f7f8740..6f8eb259 100644
--- a/include/armadillo_bits/config.hpp.cmake
+++ b/include/armadillo_bits/config.hpp.cmake
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0
+// 
 // Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
 // Copyright 2008-2016 National ICT Australia (NICTA)
 //