diff --git a/Use_Case_Diagram.md b/Use_Case_Diagram.md
index 0e2ef2b..9b54fba 100644
--- a/Use_Case_Diagram.md
+++ b/Use_Case_Diagram.md
@@ -47,11 +47,10 @@ u --> UC3
   UC3_5 .> UC3 : extend
   UC3_6 .> UC3 : extend
 u --> UC4
+  UC4_1 .> UC4 : extend
 u --> UC5
 u --> UC6
   UC6_1 .> UC6 : extend
   UC6_1 .> UC6_1_1 : include
-  
-
 
 @enduml
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