diff --git a/Form1.cs b/Form1.cs
index dc49c03..98063ad 100644
--- a/Form1.cs
+++ b/Form1.cs
@@ -7,6 +7,7 @@ using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 using System.Runtime.InteropServices;
+using System.IO;
 
 namespace WebChecker
 {
@@ -24,6 +25,8 @@ namespace WebChecker
 
 		DateTime m_LastCheckT;
 
+		StreamWriter m_FileLog = new StreamWriter("WebChecker.log", true);
+
 		public Form1()
 		{
 			InitializeComponent();
@@ -37,6 +40,8 @@ namespace WebChecker
 
 			wb.ScriptErrorsSuppressed = true;
 			wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
+
+			Log("=== App Launch ===");
 		}
 
 		void Alert(string message)
@@ -49,6 +54,20 @@ namespace WebChecker
 			FlashWindow.Stop(this);
 		}
 
+		void Log(string message)
+		{
+			Console.WriteLine("[" + DateTime.Now + "] " + message);
+			m_FileLog.WriteLine("[" + DateTime.Now + "] " + message);
+			m_FileLog.Flush();
+		}
+
+		private void Form1_FormClosing(object sender, FormClosingEventArgs e)
+		{
+			notifyIcon1.Visible = false;
+			Log("=== App Closing ===");
+			m_FileLog.Close();
+		}
+
 		void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
 		{
 			if(e.Url.Host != wb.Url.Host)
@@ -73,6 +92,7 @@ namespace WebChecker
 				if(attr.IndexOf("login") >= 0)
 				{
 					Process.Checked = false;
+					Log(url + " checked");
 					Alert("logged in");
 				}
 
@@ -110,6 +130,7 @@ namespace WebChecker
 				m_LastCheckT = DateTime.Now - TimeSpan.FromMilliseconds(CHECK_PERIOD-1000);
 
 				m_Timer.Start();
+				Log(url + " check start");
 
 				url = tbURL.Text;
 				tbURL.Enabled = false;
@@ -123,6 +144,7 @@ namespace WebChecker
 				lbStatus.Text = "상태 : 대기";
 
 				m_Timer.Stop();
+				Log(url + " check stop");
 
 				tbURL.Enabled = true;
 				if(wb.IsBusy == true)
@@ -144,11 +166,6 @@ namespace WebChecker
 			}
 		}
 
-		private void Form1_FormClosing(object sender, FormClosingEventArgs e)
-		{
-			notifyIcon1.Visible = false;
-		}
-
 		private void notifyIcon1_MouseClick(object sender, MouseEventArgs e)
 		{
 			this.Show();