diff --git a/DIRECTORY.md b/DIRECTORY.md
index fa11e44dc..f8cdd20dd 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -146,6 +146,7 @@
   * [Problem1](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem1.js)
   * [Problem2](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem2.js)
   * [Problem3](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem3.js)
+  * [Problem4](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem4.js)
   * [Problem6](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem6.js)
   * [Problem7](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem7.js)