diff --git a/Questions.md b/Questions.md
index 9f22e6a..dfda97c 100644
--- a/Questions.md
+++ b/Questions.md
@@ -51,4 +51,6 @@
 2. [Implement Queue using Stacks](https://leetcode.com/problems/implement-queue-using-stacks/description/) `Striver`
 3. [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/description/) `Leetcode 150` `Striver`
 4. [Min Stack](https://leetcode.com/problems/min-stack/description/) `Leetcode 150` `Striver`
-5. [LRU Cache](https://leetcode.com/problems/lru-cache/description/) `Leetcode 150` `Striver`
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+5. [LRU Cache](https://leetcode.com/problems/lru-cache/description/) `Leetcodze 150` `Striver`
+6. [LFU Cache](https://leetcode.com/problems/lfu-cache/description/) ``Striver`
+7. [Largest Rectangle in Histogram](https://leetcode.com/problems/largest-rectangle-in-histogram/description/) `Striver`
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