diff -r d384df40c8e7 -r e8444e0d7f1a src/edithistory.cpp
--- a/src/edithistory.cpp	Wed Sep 22 00:25:31 2021 +0300
+++ b/src/edithistory.cpp	Wed Sep 22 12:30:48 2021 +0300
@@ -1,4 +1,23 @@
+/*
+ *  LDForge: LDraw parts authoring CAD
+ *  Copyright (C) 2013 - 2020 Teemu Piippo
+ *
+ *  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, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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 <http://www.gnu.org/licenses/>.
+ */
+
 #include "edithistory.h"
+#include "modeleditcontext.h"
 
 EditHistory::EditHistory()
 {