diff --git a/README.md b/README.md
index 2955ff4..a7c4719 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ module.exports = {
     // It is forbidden to read body from Req, eg: req.body
     'authing-nestjs/forbid_read_body_from_req': 'warn',
 
-    // The parameter type annotation in the function must be a class
+    // The @Body type annotation in the function must be a class, eg: @Body() dto: ClassDto
     'authing-nestjs/use_class_as_type_in_method_of_controller': 'warn',
 
     // Each DTO field must have a class validator
diff --git a/src/rules/use-class-as-type-in-method-of-controller/use-class-as-type-in-method-of-controller.ts b/src/rules/use-class-as-type-in-method-of-controller/use-class-as-type-in-method-of-controller.ts
index ef4ac67..c0b7cff 100644
--- a/src/rules/use-class-as-type-in-method-of-controller/use-class-as-type-in-method-of-controller.ts
+++ b/src/rules/use-class-as-type-in-method-of-controller/use-class-as-type-in-method-of-controller.ts
@@ -4,7 +4,8 @@ import { IContext, ITSInterfaceDeclaration, MethodDefinition, Pattern } from 'es
 const bodyParamMap = new Map()
 
 export const messages = {
-  invalidTypeAnnotation: 'The parameter type annotation in the function must be a class'
+  invalidTypeAnnotation:
+    'The @Body type annotation in the function must be a class, eg: @Body() dto: ClassDto'
 }
 
 export const useClassAsTypeInMethodOfController = {