diff --git a/DIRECTORY.md b/DIRECTORY.md
index 88d4548ed..5f06b103f 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -335,6 +335,7 @@
   * [ReverseWords](https://github.com/TheAlgorithms/Javascript/blob/master/String/ReverseWords.js)
   * test
     * [CheckAnagram](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/CheckAnagram.test.js)
+    * [CheckFlatCase](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/CheckFlatCase.test.js)
     * [CheckPalindrome](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/CheckPalindrome.test.js)
     * [CheckPangram](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/CheckPangram.test.js)
     * [CreatePermutations](https://github.com/TheAlgorithms/Javascript/blob/master/String/test/CreatePermutations.test.js)