diff --git a/chapter_stack_and_queue/deque.md b/chapter_stack_and_queue/deque.md
index c65de91bc..478a63f54 100644
--- a/chapter_stack_and_queue/deque.md
+++ b/chapter_stack_and_queue/deque.md
@@ -2499,11 +2499,7 @@ comments: true
         return deque->queSize == 0;
     }
 
-    /* 判断双向队列是否为空 */
-    bool empty(arrayDeque *deque) {
-        return deque->queSize == 0;
-    }
-
+    /* 计算环形数组索引 */
     int dequeIndex(arrayDeque *deque, int i) {
         // 通过取余操作实现数组首尾相连
         // 当 i 越过数组尾部时，回到头部