diff --git a/DIRECTORY.md b/DIRECTORY.md
index ce186cd..24e3f1a 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -159,6 +159,8 @@
     * [Sol1](https://github.com/TheAlgorithms/Ruby/blob/master/project_euler/problem_006/sol1.rb)
   * Problem 007
     * [Sol1](https://github.com/TheAlgorithms/Ruby/blob/master/project_euler/problem_007/sol1.rb)
+  * Problem 010
+    * [Sol1](https://github.com/TheAlgorithms/Ruby/blob/master/project_euler/problem_010/sol1.rb)
   * Problem 020
     * [Sol1](https://github.com/TheAlgorithms/Ruby/blob/master/project_euler/problem_020/sol1.rb)
   * Problem 021