diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index b10fed71d..d99417f6d 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -39,7 +39,7 @@
 
 # /divide_and_conquer/
 
-# /dynamic_programming/
+# /dynamic_programming/ @Kush1101
 
 # /file_transfer/
 
@@ -63,7 +63,7 @@
 
 # /machine_learning/
 
-# /maths/
+# /maths/ @Kush1101
 
 # /matrix/
 
@@ -73,7 +73,7 @@
 
 /other/  @cclauss
 
-/project_euler/  @dhruvmanila
+/project_euler/  @dhruvmanila @Kush1101
 
 # /quantum/
 
diff --git a/DIRECTORY.md b/DIRECTORY.md
index e33d1c32b..c1358b8d7 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -63,6 +63,7 @@
   * [Playfair Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/playfair_cipher.py)
   * [Porta Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/porta_cipher.py)
   * [Rabin Miller](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rabin_miller.py)
+  * [Rail Fence Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rail_fence_cipher.py)
   * [Rot13](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rot13.py)
   * [Rsa Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rsa_cipher.py)
   * [Rsa Factorization](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rsa_factorization.py)
@@ -668,6 +669,8 @@
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_69/sol1.py)
   * Problem 71
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_71/sol1.py)
+  * Problem 72
+    * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_72/sol1.py)
   * Problem 76
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_76/sol1.py)
   * Problem 80
@@ -768,6 +771,7 @@
   * [Binary Tree Traversals](https://github.com/TheAlgorithms/Python/blob/master/traversals/binary_tree_traversals.py)
 
 ## Web Programming
+  * [Co2 Emission](https://github.com/TheAlgorithms/Python/blob/master/web_programming/co2_emission.py)
   * [Covid Stats Via Xpath](https://github.com/TheAlgorithms/Python/blob/master/web_programming/covid_stats_via_xpath.py)
   * [Crawl Google Results](https://github.com/TheAlgorithms/Python/blob/master/web_programming/crawl_google_results.py)
   * [Current Stock Price](https://github.com/TheAlgorithms/Python/blob/master/web_programming/current_stock_price.py)