diff --git a/lh-script/lh-article.cls b/lh-script/lh-article.cls
index 4864e54..72a56b6 100644
--- a/lh-script/lh-article.cls
+++ b/lh-script/lh-article.cls
@@ -4,11 +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}[1994/06/01]
 \ProvidesClass{lh-article}%
   [2016/12/28 v0.0  LaTeX class for home work / exercise sheets
diff --git a/lh-script/lh-base.sty b/lh-script/lh-base.sty
index 2109d42..f70fd3a 100644
--- a/lh-script/lh-base.sty
+++ b/lh-script/lh-base.sty
@@ -4,10 +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}[1994/06/01]
 \ProvidesPackage{lh-base}
      [2016/11/01 v0.0  Common core of the LogicalHacking.com LaTeX classes.]