diff --git a/app/MindWork AI Studio/Tools/RAG/RetrievalContentType.cs b/app/MindWork AI Studio/Tools/RAG/RetrievalContentType.cs
index fd130725..c8866118 100644
--- a/app/MindWork AI Studio/Tools/RAG/RetrievalContentType.cs	
+++ b/app/MindWork AI Studio/Tools/RAG/RetrievalContentType.cs	
@@ -6,6 +6,7 @@ namespace AIStudio.Tools.RAG;
 public enum RetrievalContentType
 {
     NOT_SPECIFIED,
+    UNKNOWN,
     
     //
     // Text Content: