diff --git a/docs/zh/the-nix-language/index.md b/docs/zh/the-nix-language/index.md
index c53f00e..9a78fad 100644
--- a/docs/zh/the-nix-language/index.md
+++ b/docs/zh/the-nix-language/index.md
@@ -179,7 +179,7 @@ in
 
 ```nix
 let
-  a = 1;
+  a = "1";
 in
 "the value of a is ${a}"  # 结果是 "the value of a is 1"
 ```