diff --git a/authorarchive.sty b/authorarchive.sty
index 98bf12a..46e4755 100644
--- a/authorarchive.sty
+++ b/authorarchive.sty
@@ -7,6 +7,8 @@
 %%   version 1 of the License, or any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
+%%
+%%   SPDX-License-Identifier: LPPL-1.0+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}\relax
 \ProvidesPackage{authorarchive}
   [2018/02/25 Unreleased v1.0.0+%