diff --git a/SurveyLib.Core/Models/Completion.cs b/SurveyLib.Core/Models/Completion.cs
index 0ba6cf3..651440d 100644
--- a/SurveyLib.Core/Models/Completion.cs
+++ b/SurveyLib.Core/Models/Completion.cs
@@ -4,7 +4,9 @@ public class Completion
 {
     public int Id { get; set; }
     public int SurveyId { get; set; }
-    public DateTime FinishedAt { get; set; }
+    public DateTime FinishedAt { get; set; } = DateTime.UtcNow;
+
+    public int? CompletedBy { get; set; }
 
     public Survey Survey { get; set; }
     public ICollection<Answer> Answers { get; set; }