diff --git a/src/Settings/OptionsPanel.Designer.cs b/src/Settings/OptionsPanel.Designer.cs
index e26bba4..ad21acd 100644
--- a/src/Settings/OptionsPanel.Designer.cs
+++ b/src/Settings/OptionsPanel.Designer.cs
@@ -161,6 +161,7 @@ private void InitializeComponent()
             "6 Hours",
             "12 Hours",
             "1 Day",
+            "3 Day",
             "Week",
             "Month"});
             this.validPeriodComboBox.Location = new System.Drawing.Point(169, 5);
diff --git a/src/Settings/OptionsPanel.cs b/src/Settings/OptionsPanel.cs
index dee88ba..6c45c65 100644
--- a/src/Settings/OptionsPanel.cs
+++ b/src/Settings/OptionsPanel.cs
@@ -293,6 +293,7 @@ public enum SHSTOCKICONID : uint
         private const long VALID_6HOURS = VALID_2HOURS * 3;
         private const long VALID_12HOURS = VALID_6HOURS * 2;
         private const long VALID_1DAY = VALID_12HOURS * 2;
+        private const long VALID_3DAYS = VALID_1DAY * 3;
         private const long VALID_7DAYS = VALID_1DAY * 7;
         private const long VALID_MONTH = VALID_1DAY * 30;
         private const long VALID_DEFAULT = Settings.VALID_PERIOD_DEFAULT;
@@ -312,8 +313,9 @@ private static long IndexToPeriod(int index)
                 case 8: return VALID_6HOURS;
                 case 9: return VALID_12HOURS;
                 case 10: return VALID_1DAY;
-                case 11: return VALID_7DAYS;
-                case 12: return VALID_MONTH;
+                case 11: return VALID_3DAYS;
+                case 12: return VALID_7DAYS;
+                case 13: return VALID_MONTH;
                 default: return VALID_DEFAULT;
             }
         }
@@ -333,8 +335,9 @@ private static int PeriodToIndex(TimeSpan timeSpan)
                 case VALID_6HOURS: return 8;
                 case VALID_12HOURS: return 9;
                 case VALID_1DAY: return 10;
-                case VALID_7DAYS: return 11;
-                case VALID_MONTH: return 12;
+                case VALID_3DAYS: return 11;
+                case VALID_7DAYS: return 12;
+                case VALID_MONTH: return 13;
                 default: return 10;
             }
         }