diff --git a/binary search tree.c b/binary search tree.c
index da16a0b..2d2d180 100644
--- a/binary search tree.c	
+++ b/binary search tree.c	
@@ -104,6 +104,7 @@ int main()
     addEdge(graph, 1, 3);
     addEdge(graph, 1, 4);
     addEdge(graph, 2, 3);
+    addEdge(graph, 2, 4);
     addEdge(graph, 3, 4);
 
     // print the adjacency list representation of the above graph