diff --git a/docs/comment.md b/docs/comment.md
index 38ddfa7..126cbe7 100644
--- a/docs/comment.md
+++ b/docs/comment.md
@@ -55,8 +55,8 @@ function doStuff(abc: string, xyz: string) {
   // do some stuff
 }
 
-// @ts-expect-error
 expect(() => {
+  // @ts-expect-error
   doStuff(123, 456);
 }).toThrow();
 ```
diff --git a/docs/tsconfig.json.md b/docs/tsconfig.json.md
index b31d427..93f7add 100644
--- a/docs/tsconfig.json.md
+++ b/docs/tsconfig.json.md
@@ -629,7 +629,7 @@ TypeScript 内置的类型描述文件，主要有以下一些，完整的清单
 - strictPropertyInitialization
 - noImplicitAny
 - noImplicitThis
-- useUnknownInCatchVaria
+- useUnknownInCatchVariables
 
 打开`strict`的时候，允许单独关闭其中一项。
 
diff --git a/docs/utility.md b/docs/utility.md
index 0182f97..d177337 100644
--- a/docs/utility.md
+++ b/docs/utility.md
@@ -644,7 +644,7 @@ type ReturnType<
 `ThisParameterType<Type>`提取函数类型中`this`参数的类型。
 
 ```typescript
-function toHex(this: Number) {
+function toHex(this:number) {
   return this.toString(16);
 }