diff --git a/README.md b/README.md
index 309f85b9..2972a851 100644
--- a/README.md
+++ b/README.md
@@ -530,7 +530,8 @@ All the translations for this repo will be listed below:
 - 📜 [Beyond `typeof` and `instanceof`: simplifying dynamic type checks — Dr. Axel Rauschmayer](http://2ality.com/2017/08/type-right.html)
 - 📜 [What Is the Instanceof Operator in JavaScript — appendTo](https://appendto.com/2016/10/what-is-the-instanceof-operator-in-javascript/)
 - 📜 [Function and Object, instances of each other — Kiro Risk](https://javascriptrefined.io/function-and-object-instances-of-each-other-1e1095d5faac)
-
+- 📜 [JavaScript instanceof operator](https://flexiple.com/javascript/instanceof-javascript)
+  
 **[⬆ Back to Top](#table-of-contents)**
 
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@@ -1047,6 +1048,7 @@ All the translations for this repo will be listed below:
 - 📜 [Object Oriented JavaScript: Polymorphism with examples — Knoldus Blogs](https://blog.knoldus.com/object-oriented-javascript-polymorphism-with-examples/)
 - 📜 [Program Like Proteus — A beginner’s guide to polymorphism in Javascript — Sam Galson](https://medium.com/yld-blog/program-like-proteus-a-beginners-guide-to-polymorphism-in-javascript-867bea7c8be2)
 - 📜 [Object-oriented JavaScript: A Deep Dive into ES6 Classes — Jeff Mott](https://www.sitepoint.com/object-oriented-javascript-deep-dive-es6-classes/)
+- 📜 [Unlocking the Power of Polymorphism in JavaScript: A Deep Dive](https://prototypr.io/post/unlocking-the-power-of-polymorphism-in-javascript-a-deep-dive)
 
 ### Videos