diff --git a/src/graph.c b/src/graph.c
index 70eb4d5..03c6163 100644
--- a/src/graph.c
+++ b/src/graph.c
@@ -625,16 +625,16 @@ static bool graph_add_edge(struct _graph* self, void* from, void* to, uint32_t w
         return false;
     }
 
-    to_node = find_node(self, from);
+    to_node = find_node(self, to);
     if (to_node == NULL)
     {
         return false;
     }
 
-    printf("print from and to obj start \n");
-    self->print_obj(from_node->obj);
-    self->print_obj(to_node->obj);
-    printf("print from and to obj end \n");
+    // printf("print from and to obj start \n");
+    // self->print_obj(from_node->obj);
+    // self->print_obj(to_node->obj);
+    // printf("print from and to obj end \n");
 
     // from_node add edge
     struct _graph_edge* new_edge = graph_edge_new(to_node, weight);
@@ -653,6 +653,7 @@ static bool graph_add_edge(struct _graph* self, void* from, void* to, uint32_t w
     }
 
     // if graph is undirected
+    // to_node add edge
     struct _graph_edge* new_edge2 = graph_edge_new(from_node, weight);
     if (new_edge2 == NULL)
     {
diff --git a/test/test_graph.c b/test/test_graph.c
index 18c9285..18d73e0 100644
--- a/test/test_graph.c
+++ b/test/test_graph.c
@@ -93,8 +93,8 @@ void test_graph_add_edge(void)
 
     // test add_edge
     TEST_ASSERT_TRUE(graph->add_edge(graph, &data[0], &data[1], 55));
-    // TEST_ASSERT_TRUE(graph->add_edge(graph, &data[0], &data[2], 66));
-    // TEST_ASSERT_TRUE(graph->add_edge(graph, &data[1], &data[3], 77));
+    TEST_ASSERT_TRUE(graph->add_edge(graph, &data[0], &data[2], 66));
+    TEST_ASSERT_TRUE(graph->add_edge(graph, &data[1], &data[3], 77));
     graph->print(graph);
 
     TEST_ASSERT_FALSE(graph->add_edge(graph, &temp, &data[1], 0));