Update README.md

README.md

@@ -61,7 +61,7 @@ We collected all combinatorics problems from the official IMO problems since 200
 | BXMO             | 1              |
 | USAMO            | 1              |
 
-Note : The complete proofs of Problem 3 and Problem 5 from 2024 have already been formalized in [https://leanprover-community.github.io/mathlib4_docs/Archive/Imo/Imo2024Q5.html](mathlib4/Archive). Therefore, we directly refer to the statements of these problems, along with the necessary definitions used in the statements. We are very grateful to Joseph Myers, the author of these two problems. We also appreciate his suggestions on the formalization of our problems.
+Note : The complete proofs of Problem 3 and Problem 5 from 2024 have already been formalized in [mathlib4/Archive](https://leanprover-community.github.io/mathlib4_docs/Archive/Imo/Imo2024Q5.html). Therefore, we directly refer to the statements of these problems, along with the necessary definitions used in the statements. We are very grateful to Joseph Myers, the author of these two problems. We also appreciate his suggestions on the formalization of our problems.
 
 ## Evaluation