diff --git a/AyCode.Core/Serializers/Toons/ToonTypeRelation.cs b/AyCode.Core/Serializers/Toons/ToonTypeRelation.cs
index 652398a..bb87971 100644
--- a/AyCode.Core/Serializers/Toons/ToonTypeRelation.cs
+++ b/AyCode.Core/Serializers/Toons/ToonTypeRelation.cs
@@ -17,6 +17,7 @@ public static class ToonTypeRelation
     /// </summary>
     public const string BaseOf = "base-of";
 
+    public const string Entity = "entity";
     /// <summary>
     /// This type is derived from another type.
     /// Example: OrderDto is derived-from Order