diff --git a/GBase/Attributes/GBaseColumnAttribute.cs b/GBase/Attributes/GBaseColumnAttribute.cs
index 58d7990..663fb7b 100644
--- a/GBase/Attributes/GBaseColumnAttribute.cs
+++ b/GBase/Attributes/GBaseColumnAttribute.cs
@@ -13,6 +13,11 @@ namespace GBase.Attributes
     [AttributeUsage(AttributeTargets.Property)]
     public class GBaseColumnAttribute : Attribute
     {
-
+        public GBaseColumnAttribute(bool isKey = false)
+        {
+            IsKey = isKey;
+        }
+        
+        public bool IsKey { get; }
     }
 }
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