diff --git a/DIRECTORY.md b/DIRECTORY.md
index 0bd470d74..43076a85e 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -333,3 +333,4 @@
   * [Knuth Morris Pratt](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/strings/knuth_morris_pratt.cpp)
   * [Manacher Algorithm](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/strings/manacher_algorithm.cpp)
   * [Rabin Karp](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/strings/rabin_karp.cpp)
+  * [Z Function](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/strings/z_function.cpp)