diff --git a/README.md b/README.md
index bb05b98..b3d472b 100644
--- a/README.md
+++ b/README.md
@@ -130,6 +130,16 @@ All decorators accept an object of options that apply to the type being used, fo
 
 [**@Any({})**](https://github.com/icebob/fastest-validator#any) - Applies { type: "any" }
 
+[**@Multi({})**](https://github.com/icebob/fastest-validator#multi) - Applies { type: "multi" }
+
+Also resolves to multi if multiple decorators are stacked on a single field.
+
+```ts
+@String()
+@Number()
+prop1: string | number;
+```
+
 **@Nested({})** - Applies { type: "object", props: {} } (The props are gathered from the nested schema)
 
 **@NestedArray({ validator: `<ValidatorSchema>` })** - Applies { type: "array", "items": { type :"object",  props: { ... } }} (The props are gathered from the nested schema)
diff --git a/src/utils/get-prototype-chain.ts b/src/utils/get-prototype-chain.ts
index 3e62c55..c257caa 100644
--- a/src/utils/get-prototype-chain.ts
+++ b/src/utils/get-prototype-chain.ts
@@ -5,7 +5,7 @@ import type { Class } from "type-fest";
  * Used for schema inheritance detection
  * Maybe find a way to do the same thing with reflect metadata ?
  */
-export function getPrototypeChain (object: Class<any>): Class<any>[] {
+export function getPrototypeChain (object: any): Class<any>[] {
   let proto = object;
   const protos: Class<any>[] = [object];