diff --git a/codes/c/chapter_array_and_linkedlist/my_list.c b/codes/c/chapter_array_and_linkedlist/my_list.c
index f8ab8f560..b261a6877 100644
--- a/codes/c/chapter_array_and_linkedlist/my_list.c
+++ b/codes/c/chapter_array_and_linkedlist/my_list.c
@@ -68,6 +68,10 @@ void add(myList *list, int num) {
 /* 中间插入元素 */
 void insert(myList *list, int index, int num) {
     assert(index >= 0 && index < size(list));
+    // 元素数量超出容量时，触发扩容机制
+    if (size(list) == capacity(list)) {
+        extendCapacity(list); // 扩容
+    }
     for (int i = size(list); i > index; --i) {
         list->nums[i] = list->nums[i - 1];
     }