diff --git a/YavscLib/ISpecializationSettings.cs b/YavscLib/ISpecializationSettings.cs
index 6049c323..6c6aa35f 100644
--- a/YavscLib/ISpecializationSettings.cs
+++ b/YavscLib/ISpecializationSettings.cs
@@ -2,5 +2,6 @@ namespace YavscLib
 {
     public interface ISpecializationSettings
     {
+        string UserId { get ; set ; }
     }
 }
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