diff --git a/snapshotmanager.h b/snapshotmanager.h
--- a/snapshotmanager.h
+++ b/snapshotmanager.h
@@ -1,3 +1,21 @@
+/*
+  Copyright © 2015 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot 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.
+
+  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
 
 #ifndef SNAPSHOTMANAGER_H
 #define SNAPSHOTMANAGER_H
@@ -9,8 +27,6 @@
 #include "framebuffer.h"
 #include "snapshot.h"
 
-// class MainWindow;
-
 class SnapshotManager : public QObject
 {
     Q_OBJECT
@@ -26,20 +42,20 @@ private:
     QMainWindow* _mainWindow;
     QList<FrameBuffer*>* _channelBuffers;
 
-    QList<SnapShot*> snapshots;
+    QList<Snapshot*> snapshots;
 
     QMenu _menu;
     QAction _takeSnapshotAction;
     QAction loadSnapshotAction;
     QAction clearAction;
 
-    void addSnapshot(SnapShot* snapshot, bool update_menu=true);
+    void addSnapshot(Snapshot* snapshot, bool update_menu=true);
     void updateMenu();
 
 private slots:
     void takeSnapshot();
     void clearSnapshots();
-    void deleteSnapshot(SnapShot* snapshot);
+    void deleteSnapshot(Snapshot* snapshot);
     void loadSnapshots();
     void loadSnapshotFromFile(QString fileName);
 };