diff --git a/cores/esp8266/Schedule.cpp b/cores/esp8266/Schedule.cpp
index 9cb86c8d1d..5ac887ce10 100644
--- a/cores/esp8266/Schedule.cpp
+++ b/cores/esp8266/Schedule.cpp
@@ -1,3 +1,20 @@
+/*
+ Schedule.cpp - Scheduled functions.
+ Copyright (c) 2020 esp8266/Arduino
+ 
+ This file is part of the esp8266 core for Arduino environment.
+ 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; either
+ version 2.1 of the License, or (at your option) any later version.
+ 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, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
 
 #include <assert.h>
 
diff --git a/cores/esp8266/Schedule.h b/cores/esp8266/Schedule.h
index 48111c33ed..da86e5b7f5 100644
--- a/cores/esp8266/Schedule.h
+++ b/cores/esp8266/Schedule.h
@@ -1,3 +1,21 @@
+/*
+ Schedule.h - Header file for scheduled functions.
+ Copyright (c) 2020 esp8266/Arduino
+ 
+ This file is part of the esp8266 core for Arduino environment.
+ 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; either
+ version 2.1 of the License, or (at your option) any later version.
+ 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, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
 #ifndef ESP_SCHEDULE_H
 #define ESP_SCHEDULE_H