diff --git a/COPYING.LGPL-2.1.md b/COPYING.LGPL-2.1.md
index 7da4910..60ef75d 100644
--- a/COPYING.LGPL-2.1.md
+++ b/COPYING.LGPL-2.1.md
@@ -475,3 +475,27 @@ SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 DAMAGES.
 
                      END OF TERMS AND CONDITIONS
+
+## How to Apply These Terms to MARS-NWE Libraries
+
+To make a MARS-NWE library or library-style source file use LGPL-2.1-only,
+attach the following notices to the start of the file when practical.  The
+`SPDX-License-Identifier` line is the authoritative short form used by this
+project.
+
+```text
+<one line to give the library's name and a brief idea of what it does.>
+Copyright (C) <year>  <name of author>
+SPDX-License-Identifier: LGPL-2.1-only
+
+This library is free software; you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License as published by the Free
+Software Foundation; version 2.1 of the License only.
+
+This library is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this library.  If not, see <https://www.gnu.org/licenses/>.
+```
diff --git a/COPYING.md b/COPYING.md
index e5d1707..11b8590 100644
--- a/COPYING.md
+++ b/COPYING.md
@@ -298,3 +298,27 @@ PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGES.
 
                      END OF TERMS AND CONDITIONS
+
+## How to Apply These Terms to MARS-NWE Programs
+
+To make a MARS-NWE program, tool, or non-library source file use GPL-2.0-only,
+attach the following notices to the start of the file when practical.  The
+`SPDX-License-Identifier` line is the authoritative short form used by this
+project.
+
+```text
+<one line to give the program's name and a brief idea of what it does.>
+Copyright (C) <year>  <name of author>
+SPDX-License-Identifier: GPL-2.0-only
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License only.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program.  If not, see <https://www.gnu.org/licenses/>.
+```