diff --git a/EXmDNS.cpp b/EXmDNS.cpp
index b4fc200..6cc1090 100644
--- a/EXmDNS.cpp
+++ b/EXmDNS.cpp
@@ -1,3 +1,22 @@
+/*
+ *  © 2024 Harald Barth
+ *  All rights reserved.
+ *
+ *  This file is part of CommandStation-EX
+ *
+ *  This 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, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  It 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 CommandStation.  If not, see <https://www.gnu.org/licenses/>.
+ */
 
 #include <Arduino.h>
 #include "EthernetInterface.h"
diff --git a/EXmDNS.h b/EXmDNS.h
index fd50a2a..d8b24d2 100644
--- a/EXmDNS.h
+++ b/EXmDNS.h
@@ -1,3 +1,22 @@
+/*
+ *  © 2024 Harald Barth
+ *  All rights reserved.
+ *
+ *  This file is part of CommandStation-EX
+ *
+ *  This 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, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  It 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 CommandStation.  If not, see <https://www.gnu.org/licenses/>.
+ */
 
 #define BROADCASTTIME 15 //seconds
 
diff --git a/STM32lwipopts.h b/STM32lwipopts.h
index 9f6e0c5..8efc641 100644
--- a/STM32lwipopts.h
+++ b/STM32lwipopts.h
@@ -1,5 +1,26 @@
-
-
+/*
+ *  © 2024 Harald Barth
+ *  All rights reserved.
+ *
+ *  This file is part of CommandStation-EX
+ *
+ *  This 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, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  It 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 CommandStation.  If not, see <https://www.gnu.org/licenses/>.
+ */
+//
+// Rewrite of the STM32lwipopts.h file from STM
+// To be copied into where lwipopts_default.h resides
+//
 #ifndef __STM32LWIPOPTS_H__
 #define __STM32LWIPOPTS_H__