diff --git a/Use_Case_Diagram.md b/Use_Case_Diagram.md
index 200c332..d41e242 100644
--- a/Use_Case_Diagram.md
+++ b/Use_Case_Diagram.md
@@ -35,21 +35,21 @@ rectangle Dice_App {
 
 u --> UC1
   UC1 ..> UC1_1 : include
-  UC1 .> UC1_2 : include
+  UC1 ..> UC1_2 : include
 u --> UC2
 u --> UC3
-  UC3_1 --|> UC3
-  UC3_2 --|> UC3
-  UC3_3 .> UC3 : extend
-  UC3_3_1 .> UC3_3 : extend
-  UC3_4 .> UC3 : extend
-  UC3_5 .> UC3 : extend
-  UC3_6 .> UC3 : extend
+  UC3_1 -|> UC3
+  UC3_2 -|> UC3
+  UC3_3 ..> UC3 : extend
+  UC3_3_1 ..> UC3_3 : extend
+  UC3_4 ..> UC3 : extend
+  UC3_5 ..> UC3 : extend
+  UC3_6 ..> UC3 : extend
 u --> UC4
-  UC4_1 .> UC4 : extend
+  UC4_1 ..> UC4 : extend
 u --> UC5
 u --> UC6
-  UC6_1 .> UC6 : extend
-  UC6_1 .> UC6_1_1 : include
+  UC6_1 ..> UC6 : extend
+  UC6_1 ..> UC6_1_1 : include
 
 @enduml
\ No newline at end of file