diff --git a/docs/uts/function.md b/docs/uts/function.md
index 4e1c1696c5d64f8b4bf78ac4986ed13ad52512e2..e2c45fb4ce08dfd410478c1caabff5a09124b356 100644
--- a/docs/uts/function.md
+++ b/docs/uts/function.md
@@ -350,7 +350,7 @@ fn()
 ```
 
 ```ts
-const fn: (() => void) | null = null
+let fn: (() => void) | null = null
 fn = function () {
     console.log(fn) // 此时 fn 可以正常访问
 }