diff --git a/DIRECTORY.md b/DIRECTORY.md
index 3e722a878..ba7d3e62a 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -56,8 +56,13 @@
 
 ## Boolean Algebra
   * [And Gate](boolean_algebra/and_gate.py)
+  * [Nand Gate](boolean_algebra/nand_gate.py)
   * [Norgate](boolean_algebra/norgate.py)
+  * [Not Gate](boolean_algebra/not_gate.py)
+  * [Or Gate](boolean_algebra/or_gate.py)
   * [Quine Mc Cluskey](boolean_algebra/quine_mc_cluskey.py)
+  * [Xnor Gate](boolean_algebra/xnor_gate.py)
+  * [Xor Gate](boolean_algebra/xor_gate.py)
 
 ## Cellular Automata
   * [Conways Game Of Life](cellular_automata/conways_game_of_life.py)
@@ -288,6 +293,7 @@
   * [Iterating Through Submasks](dynamic_programming/iterating_through_submasks.py)
   * [Knapsack](dynamic_programming/knapsack.py)
   * [Longest Common Subsequence](dynamic_programming/longest_common_subsequence.py)
+  * [Longest Common Substring](dynamic_programming/longest_common_substring.py)
   * [Longest Increasing Subsequence](dynamic_programming/longest_increasing_subsequence.py)
   * [Longest Increasing Subsequence O(Nlogn)](dynamic_programming/longest_increasing_subsequence_o(nlogn).py)
   * [Longest Sub Array](dynamic_programming/longest_sub_array.py)
@@ -298,6 +304,7 @@
   * [Minimum Coin Change](dynamic_programming/minimum_coin_change.py)
   * [Minimum Cost Path](dynamic_programming/minimum_cost_path.py)
   * [Minimum Partition](dynamic_programming/minimum_partition.py)
+  * [Minimum Squares To Represent A Number](dynamic_programming/minimum_squares_to_represent_a_number.py)
   * [Minimum Steps To One](dynamic_programming/minimum_steps_to_one.py)
   * [Optimal Binary Search Tree](dynamic_programming/optimal_binary_search_tree.py)
   * [Rod Cutting](dynamic_programming/rod_cutting.py)
@@ -474,6 +481,7 @@
   * [Add](maths/add.py)
   * [Aliquot Sum](maths/aliquot_sum.py)
   * [Allocation Number](maths/allocation_number.py)
+  * [Arc Length](maths/arc_length.py)
   * [Area](maths/area.py)
   * [Area Under Curve](maths/area_under_curve.py)
   * [Armstrong Numbers](maths/armstrong_numbers.py)
@@ -609,7 +617,9 @@
 ## Matrix
   * [Binary Search Matrix](matrix/binary_search_matrix.py)
   * [Count Islands In Matrix](matrix/count_islands_in_matrix.py)
+  * [Cramers Rule 2X2](matrix/cramers_rule_2x2.py)
   * [Inverse Of Matrix](matrix/inverse_of_matrix.py)
+  * [Largest Square Area In Matrix](matrix/largest_square_area_in_matrix.py)
   * [Matrix Class](matrix/matrix_class.py)
   * [Matrix Operation](matrix/matrix_operation.py)
   * [Max Area Of Island](matrix/max_area_of_island.py)
@@ -657,6 +667,7 @@
 ## Physics
   * [Casimir Effect](physics/casimir_effect.py)
   * [Horizontal Projectile Motion](physics/horizontal_projectile_motion.py)
+  * [Kinetic Energy](physics/kinetic_energy.py)
   * [Lorentz Transformation Four Vector](physics/lorentz_transformation_four_vector.py)
   * [N Body Simulation](physics/n_body_simulation.py)
   * [Newtons Law Of Gravitation](physics/newtons_law_of_gravitation.py)
@@ -948,7 +959,6 @@
   * [Not Gate](quantum/not_gate.py)
   * [Q Full Adder](quantum/q_full_adder.py)
   * [Quantum Entanglement](quantum/quantum_entanglement.py)
-  * [Quantum Random](quantum/quantum_random.py)
   * [Ripple Adder Classic](quantum/ripple_adder_classic.py)
   * [Single Qubit Measure](quantum/single_qubit_measure.py)
   * [Superdense Coding](quantum/superdense_coding.py)
@@ -1048,6 +1058,7 @@
   * [Hamming Distance](strings/hamming_distance.py)
   * [Indian Phone Validator](strings/indian_phone_validator.py)
   * [Is Contains Unique Chars](strings/is_contains_unique_chars.py)
+  * [Is Isogram](strings/is_isogram.py)
   * [Is Palindrome](strings/is_palindrome.py)
   * [Is Pangram](strings/is_pangram.py)
   * [Is Spain National Id](strings/is_spain_national_id.py)