diff --git a/leetcode/README.md b/leetcode/README.md
index 155d3f372..64e8d74c8 100644
--- a/leetcode/README.md
+++ b/leetcode/README.md
@@ -61,3 +61,4 @@ LeetCode
 |938|[Range Sum of BST](https://leetcode.com/problems/range-sum-of-bst/) | [C](./src/938.c)|Easy|
 |965|[Univalued Binary Tree](https://leetcode.com/problems/univalued-binary-tree/) | [C](./src/965.c)|Easy|
 |977|[Squares of a Sorted Array](https://leetcode.com/problems/squares-of-a-sorted-array/) | [C](./src/977.c)|Easy|
+|1189|[Maximum Number of Balloons](https://leetcode.com/problems/maximum-number-of-balloons/) | [C](./src/1189.c)|Easy|
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