diff --git a/CalendarNotepad/Extends/DbContext.cs b/CalendarNotepad/Extends/DbContext.cs
index a92b87c..b4e0706 100644
--- a/CalendarNotepad/Extends/DbContext.cs
+++ b/CalendarNotepad/Extends/DbContext.cs
@@ -25,9 +25,11 @@ namespace CalendarNotepad.Extends
         /// </summary>
         public void DbInit() {
             using var db = new DbContext();
+            db.CodeFirst.SetStringDefaultLength(200);
             db.CodeFirst.InitTables<WorkUnit>();
             db.CodeFirst.InitTables<PlusFileUnit>();
             db.CodeFirst.InitTables<WorkUnitPlusFile>();
+
         }
 
         /// <summary>