diff --git a/DIRECTORY.md b/DIRECTORY.md
index 66d00cf29..132976f04 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -100,6 +100,7 @@
   * [Extended Euclid Algorithm](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/math/extended_euclid_algorithm.cpp)
   * [Factorial](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/math/factorial.cpp)
   * [Fast Power](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/math/fast_power.cpp)
+  * [Fibonacci](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/math/fibonacci.cpp)
   * [Greatest Common Divisor](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/math/greatest_common_divisor.cpp)
   * [Greatest Common Divisor Euclidean](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/math/greatest_common_divisor_euclidean.cpp)
   * [Modular Inverse Fermat Little Theorem](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/math/modular_inverse_fermat_little_theorem.cpp)