diff --git a/DigitalData.UserManager.Application/DTOs/User/UserReadDto.cs b/DigitalData.UserManager.Application/DTOs/User/UserReadDto.cs
index b44afce..fbfef1b 100644
--- a/DigitalData.UserManager.Application/DTOs/User/UserReadDto.cs
+++ b/DigitalData.UserManager.Application/DTOs/User/UserReadDto.cs
@@ -12,23 +12,29 @@ namespace DigitalData.UserManager.Application.DTOs.User
 
 		public string? Name { get; set; }
 
-		public string Username { get; set; }
+		public required string Username { get; set; }
 
 		public string? Shortname { get; set; }
 
 		public string? Email { get; set; }
 
-		public string Language { get; set; }
+		public required string Language { get; set; }
 
 		public string? Comment { get; set; }
 
 		public bool Deleted { get; set; }
 
-		public string DateFormat { get; set; }
+		public required string DateFormat { get; set; }
 
-		public string AddedWho { get; set; }
+        public string? ChangedWho { get; set; }
 
-		public bool Active { get; set; }
+        public required DateTime? ChangedWhen { get; set; }
+
+        public string? AddedWho { get; init; }
+
+        public required DateTime AddedWhen { get; init; }
+		
+        public bool Active { get; set; }
 
 		[JsonIgnore]
 		[NotMapped]