diff --git a/Section.cpp b/Section.cpp
index d1b4012..22625ee 100644
--- a/Section.cpp
+++ b/Section.cpp
@@ -1,3 +1,23 @@
+/*
+    Elypson/qt-collapsible-section
+    (c) 2016 Michael A. Voelkel - michael.alexander.voelkel@gmail.com
+
+    This file is part of Elypson/qt-collapsible section.
+
+    Elypson/qt-collapsible-section 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 3 of the License, or
+    (at your option) any later version.
+
+    Elypson/qt-collapsible-section 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 General Public License
+    along with Elypson/qt-collapsible-section. If not, see <http://www.gnu.org/licenses/>.
+*/    
+
 #include <QPropertyAnimation>
 
 #include "Section.h"
diff --git a/Section.h b/Section.h
index 589425e..a5552d9 100644
--- a/Section.h
+++ b/Section.h
@@ -1,3 +1,23 @@
+/*
+    Elypson/qt-collapsible-section
+    (c) 2016 Michael A. Voelkel - michael.alexander.voelkel@gmail.com
+
+    This file is part of Elypson/qt-collapsible section.
+
+    Elypson/qt-collapsible-section 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 3 of the License, or
+    (at your option) any later version.
+
+    Elypson/qt-collapsible-section 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 General Public License
+    along with Elypson/qt-collapsible-section. If not, see <http://www.gnu.org/licenses/>.
+*/    
+
 #ifndef SECTION_H
 #define SECTION_H
 
diff --git a/main.cpp b/main.cpp
index b48f94e..9a69e9e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,3 +1,23 @@
+/*
+    Elypson/qt-collapsible-section
+    (c) 2016 Michael A. Voelkel - michael.alexander.voelkel@gmail.com
+
+    This file is part of Elypson/qt-collapsible section.
+
+    Elypson/qt-collapsible-section 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 3 of the License, or
+    (at your option) any later version.
+
+    Elypson/qt-collapsible-section 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 General Public License
+    along with Elypson/qt-collapsible-section. If not, see <http://www.gnu.org/licenses/>.
+*/    
+
 #include "mainwindow.h"
 #include <QApplication>
 
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 5f10e64..9192f10 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1,3 +1,23 @@
+/*
+    Elypson/qt-collapsible-section
+    (c) 2016 Michael A. Voelkel - michael.alexander.voelkel@gmail.com
+
+    This file is part of Elypson/qt-collapsible section.
+
+    Elypson/qt-collapsible-section 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 3 of the License, or
+    (at your option) any later version.
+
+    Elypson/qt-collapsible-section 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 General Public License
+    along with Elypson/qt-collapsible-section. If not, see <http://www.gnu.org/licenses/>.
+*/    
+
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include "Section.h"
diff --git a/mainwindow.h b/mainwindow.h
index a3948a9..80a77d1 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -1,3 +1,23 @@
+/*
+    Elypson/qt-collapsible-section
+    (c) 2016 Michael A. Voelkel - michael.alexander.voelkel@gmail.com
+
+    This file is part of Elypson/qt-collapsible section.
+
+    Elypson/qt-collapsible-section 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 3 of the License, or
+    (at your option) any later version.
+
+    Elypson/qt-collapsible-section 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 General Public License
+    along with Elypson/qt-collapsible-section. If not, see <http://www.gnu.org/licenses/>.
+*/    
+
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H