diff --git a/tuos-fonts/README.md b/tuos-fonts/README.md
index a793515..fe7409e 100644
--- a/tuos-fonts/README.md
+++ b/tuos-fonts/README.md
@@ -67,5 +67,5 @@ content.
 
 ## License
 This project is dual-licensed under a 2-clause BSD-style license and/or 
-the LPPL version 1 or any later version. 
+the LPPL version 1.3c or (at your opinion) any later version. 
 
diff --git a/tuos-fonts/tuos-fonts.sty b/tuos-fonts/tuos-fonts.sty
index ff2e60f..92e1fdc 100644
--- a/tuos-fonts/tuos-fonts.sty
+++ b/tuos-fonts/tuos-fonts.sty
@@ -4,9 +4,11 @@
 %%   This program can be redistributed and/or modified under the terms
 %%   of the LaTeX Project Public License Distributed from CTAN
 %%   archives in directory macros/latex/base/lppl.txt; either
-%%   version 1 of the License, or any later version.
+%%   version 1.3c of the License, or (at your opinion) any later version.
 %%   OR
 %%   The 2-clause BSD-style license.
+%%
+%%   SPDX-License-Identifier: LPPL-1.3c+ OR BSD-2-Clause
 \NeedsTeXFormat{LaTeX2e}
 \ProvidesPackage{tuos-fonts}
    [2016/08/20 v1.1 The University of Sheffield cooperate fonts (Stephenson and Blake).]