added more documentation to @requestBody

README.md

@@ -215,7 +215,7 @@ Binds a method parameter to request.params object or to a specific parameter if
 Binds a method parameter to request.query or to a specific query parameter if a name is passed.
 
 ### `@requestBody(name?: string)`
-Binds a method parameter to request.body or to a specific body property if a name is passed.
+Binds a method parameter to request.body or to a specific body property if a name is passed. If the bodyParser middleware is not used on the express app, this will bind the method parameter to the express request object.
 
 ### `@requestHeaders(name?: string)`
 Binds a method parameter to the request headers.