diff --git a/source/chapter2/12_Subscripts.md b/source/chapter2/12_Subscripts.md
index e69de29b..9ea25e9b 100644
--- a/source/chapter2/12_Subscripts.md
+++ b/source/chapter2/12_Subscripts.md
@@ -0,0 +1,3 @@
+# 下标 (Subscripts)
+
+类、结构体和枚举都可以定义下标，可以认为是访问对象、集合或序列的快捷方式。
\ No newline at end of file