diff --git a/Use_Case_Diagram.md b/Use_Case_Diagram.md
index d0bd58f..6c4b860 100644
--- a/Use_Case_Diagram.md
+++ b/Use_Case_Diagram.md
@@ -40,6 +40,9 @@ u --> UC1
 u --> UC2
 u --> UC3
   UC3_1 --|> UC3
+  UC3_2 --|> UC3
+  UC3_3 .> UC3 : extend
+  UC3_3_1 .> UC3_3 : extend
 u --> UC4
 u --> UC5
 u --> UC6