diff --git a/src/others/tortoise_and_hare.md b/src/others/tortoise_and_hare.md
index 385ca69f4..9d2ba0a96 100644
--- a/src/others/tortoise_and_hare.md
+++ b/src/others/tortoise_and_hare.md
@@ -110,5 +110,6 @@ And since we let the slow pointer start at the start of the linked list, after $
# Problems:
- [Linked List Cycle (EASY)](https://leetcode.com/problems/linked-list-cycle/)
+- [Happy Number (Easy)](https://leetcode.com/problems/happy-number/)
- [Find the Duplicate Number (Medium)](https://leetcode.com/problems/find-the-duplicate-number/)
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