diff --git a/src/setting_defines.h b/src/setting_defines.h
--- a/src/setting_defines.h
+++ b/src/setting_defines.h
@@ -1,5 +1,5 @@
 /*
-  Copyright © 2017 Hasan Yavuz Özderya
+  Copyright © 2018 Hasan Yavuz Özderya
 
   This file is part of serialplot.
 
@@ -30,6 +30,7 @@ const char SettingGroup_Channels[] = "Ch
 const char SettingGroup_Plot[] = "Plot";
 const char SettingGroup_Commands[] = "Commands";
 const char SettingGroup_Record[] = "Record";
+const char SettingGroup_UpdateCheck[] = "UpdateCheck";
 
 // mainwindow setting keys
 const char SG_MainWindow_Size[] = "size";
@@ -57,6 +58,8 @@ const char SG_Binary_Endianness[] = "end
 
 // ascii reader keys
 const char SG_ASCII_NumOfChannels[] = "numOfChannels";
+const char SG_ASCII_Delimiter[] = "delimiter";
+const char SG_ASCII_CustomDelimiter[] = "customDelimiter";
 
 // framed reader keys
 const char SG_CustomFrame_NumOfChannels[] = "numOfChannels";
@@ -68,14 +71,19 @@ const char SG_CustomFrame_Endianness[] =
 const char SG_CustomFrame_Checksum[] = "checksum";
 const char SG_CustomFrame_DebugMode[] = "debugMode";
 
-// channel manager keys
+// channel info keys
 const char SG_Channels_Channel[] = "channel";
 const char SG_Channels_Name[] = "name";
 const char SG_Channels_Color[] = "color";
 const char SG_Channels_Visible[] = "visible";
+const char SG_Channels_Gain[] = "gain";
+const char SG_Channels_GainEn[] = "gainEnabled";
+const char SG_Channels_Offset[] = "offset";
+const char SG_Channels_OffsetEn[] = "offsetEnabled";
 
 // plot settings keys
 const char SG_Plot_NumOfSamples[] = "numOfSamples";
+const char SG_Plot_PlotWidth[] = "plotWidth";
 const char SG_Plot_IndexAsX[] = "indexAsX";
 const char SG_Plot_XMax[] = "xMax";
 const char SG_Plot_XMin[] = "xMin";
@@ -102,5 +110,10 @@ const char SG_Record_StopOnClose[]      
 const char SG_Record_Header[]           = "header";
 const char SG_Record_Separator[]        = "separator";
 const char SG_Record_DisableBuffering[] = "disableBuffering";
+const char SG_Record_Timestamp[]        = "timestamp";
+
+// update check settings keys
+const char SG_UpdateCheck_Periodic[]  = "periodicCheck";
+const char SG_UpdateCheck_LastCheck[] = "lastCheck";
 
 #endif // SETTING_DEFINES_H