diff --git a/chapter_graph/graph_operations.md b/chapter_graph/graph_operations.md
index f94def5a6..dda7ea2a5 100644
--- a/chapter_graph/graph_operations.md
+++ b/chapter_graph/graph_operations.md
@@ -1289,7 +1289,7 @@ comments: true
     class GraphAdjList
     {
         // 邻接表，key: 顶点，value：该顶点的所有邻接顶点
-        Dictionary<Vertex, List<Vertex>> adjList;
+        public Dictionary<Vertex, List<Vertex>> adjList;
 
         /* 构造函数 */
         public GraphAdjList(Vertex[][] edges)