diff --git a/README.md b/README.md
index 23347a7..6781642 100644
--- a/README.md
+++ b/README.md
@@ -7,5 +7,10 @@ Resolving problems of LeetCode in RustLang.
 
 ## Solusions
 
-* [7. Reverse Integer](./reverse_integer/README.md)
-* [15. 3 Sum](./three_sum/README.md)
+* [7. Reverse Integer](./reverse_integer/src/lib.rs)
+* [15. 3 Sum](./three_sum/src/lib.rs)
+* [215. Kth Largest Element in an Array](./kth_largest/src/lib.rs)
+
+## References
+
+* [LeetcodeTop](https://github.com/afatcoder/LeetcodeTop): Top Hit Leetcode problems in interviews.
diff --git a/kth_largest/README.md b/kth_largest/README.md
deleted file mode 100644
index e29a350..0000000
--- a/kth_largest/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# 215. Kth Largest Element in an Array
-
-* [problem link](https://leetcode.com/problems/kth-largest-element-in-an-array/)
diff --git a/kth_largest/src/lib.rs b/kth_largest/src/lib.rs
index cb35a1c..e04fc56 100644
--- a/kth_largest/src/lib.rs
+++ b/kth_largest/src/lib.rs
@@ -1,8 +1,15 @@
-#![allow(dead_code)]
-
 /*!
- * It works but slower than:
- * ```rust,ignore
+ * # 215. Kth Largest Element in an Array
+ *
+ * * [Problem link](https://leetcode.com/problems/kth-largest-element-in-an-array/)
+ *
+ * ## Other Solutions
+ *
+ * The solution works but slower than sort all elements and get by index in Rust like below.
+ *
+ * ```rust,no_run
+ * # struct Solution {}
+ *
  * impl Solution {
  *     pub fn find_kth_largest(nums: Vec<i32>, k: i32) -> i32 {
  *         let mut nums = nums;
@@ -11,7 +18,9 @@
  *     }
  * }
  * ```
-*/
+ */
+
+#![allow(dead_code)]
 
 struct Solution {}
 
diff --git a/reverse_integer/README.md b/reverse_integer/README.md
deleted file mode 100644
index 96d60ae..0000000
--- a/reverse_integer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# 7. Reverse Integer
-
-* [Link](https://leetcode.com/problems/reverse-integer/)
diff --git a/reverse_integer/src/lib.rs b/reverse_integer/src/lib.rs
index 6f1a512..219a0d7 100644
--- a/reverse_integer/src/lib.rs
+++ b/reverse_integer/src/lib.rs
@@ -1,3 +1,9 @@
+/*!
+ * # 7. Reverse Integer
+ *
+ * * [Problem link](https://leetcode.com/problems/reverse-integer/)
+ */
+
 #![allow(dead_code)]
 
 struct Solution {}
diff --git a/three_sum/README.md b/three_sum/README.md
deleted file mode 100644
index e33f51b..0000000
--- a/three_sum/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# 15. 3 Sum
-
-* [problem link](https://leetcode.com/problems/3sum/)
diff --git a/three_sum/src/lib.rs b/three_sum/src/lib.rs
index 42bb4d7..8b7f824 100644
--- a/three_sum/src/lib.rs
+++ b/three_sum/src/lib.rs
@@ -1,3 +1,9 @@
+/*!
+ * # 15. 3 Sum
+ *
+ * * [Problem link](https://leetcode.com/problems/3sum/)
+ */
+
 #![allow(dead_code)]
 
 struct Solution {}