diff --git a/DIRECTORY.md b/DIRECTORY.md
index 19f15a90..dc067c80 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -118,6 +118,8 @@
   * [AmicableNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/AmicableNumber.java)
   * [Area](https://github.com/TheAlgorithms/Java/blob/master/Maths/Area.java)
   * [Average](https://github.com/TheAlgorithms/Java/blob/master/Maths/Average.java)
+  * [Ceil](https://github.com/TheAlgorithms/Java/blob/master/Maths/Ceil.java)
+  * [Combinations](https://github.com/TheAlgorithms/Java/blob/master/Maths/Combinations.java)
   * [Factorial](https://github.com/TheAlgorithms/Java/blob/master/Maths/Factorial.java)
   * [FactorialRecursion](https://github.com/TheAlgorithms/Java/blob/master/Maths/FactorialRecursion.java)
   * [FibonacciNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/FibonacciNumber.java)
@@ -125,14 +127,18 @@
   * [FindMaxRecursion](https://github.com/TheAlgorithms/Java/blob/master/Maths/FindMaxRecursion.java)
   * [FindMin](https://github.com/TheAlgorithms/Java/blob/master/Maths/FindMin.java)
   * [FindMinRecursion](https://github.com/TheAlgorithms/Java/blob/master/Maths/FindMinRecursion.java)
+  * [Floor](https://github.com/TheAlgorithms/Java/blob/master/Maths/Floor.java)
   * [GCD](https://github.com/TheAlgorithms/Java/blob/master/Maths/GCD.java)
   * [GCDRecursion](https://github.com/TheAlgorithms/Java/blob/master/Maths/GCDRecursion.java)
+  * [LucasSeries](https://github.com/TheAlgorithms/Java/blob/master/Maths/LucasSeries.java)
   * [MaxValue](https://github.com/TheAlgorithms/Java/blob/master/Maths/MaxValue.java)
   * [MinValue](https://github.com/TheAlgorithms/Java/blob/master/Maths/MinValue.java)
   * [NumberOfDigits](https://github.com/TheAlgorithms/Java/blob/master/Maths/NumberOfDigits.java)
   * [PalindromeNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/PalindromeNumber.java)
   * [ParseInteger](https://github.com/TheAlgorithms/Java/blob/master/Maths/ParseInteger.java)
+  * [PerfectCube](https://github.com/TheAlgorithms/Java/blob/master/Maths/PerfectCube.java)
   * [PerfectNumber](https://github.com/TheAlgorithms/Java/blob/master/Maths/PerfectNumber.java)
+  * [PerfectSquare](https://github.com/TheAlgorithms/Java/blob/master/Maths/PerfectSquare.java)
   * [Pow](https://github.com/TheAlgorithms/Java/blob/master/Maths/Pow.java)
   * [PowRecursion](https://github.com/TheAlgorithms/Java/blob/master/Maths/PowRecursion.java)
   * [PrimeCheck](https://github.com/TheAlgorithms/Java/blob/master/Maths/PrimeCheck.java)