From 5e8c8c7476112a497087ccb5037eedd069ba5050 Mon Sep 17 00:00:00 2001
From: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Date: Wed, 22 Jul 2020 17:53:38 +0000
Subject: [PATCH] updating DIRECTORY.md

---
 DIRECTORY.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/DIRECTORY.md b/DIRECTORY.md
index e50e18eaf..acbef7563 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -211,3 +211,6 @@
   * [ShellSort](https://github.com/TheAlgorithms/Java/blob/master/Sorts/ShellSort.java)
   * [SortAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SortAlgorithm.java)
   * [SortUtils](https://github.com/TheAlgorithms/Java/blob/master/Sorts/SortUtils.java)
+
+## Strings
+  * [ZFunction](https://github.com/TheAlgorithms/Java/blob/master/Strings/ZFunction.java)