diff --git a/advanced_expert/vulnerabilities/README.md b/advanced_expert/vulnerabilities/README.md
index 6a32990..52e1a21 100644
--- a/advanced_expert/vulnerabilities/README.md
+++ b/advanced_expert/vulnerabilities/README.md
@@ -22,10 +22,13 @@
 * **[reentrancy](reentrancy_attacks)**
 * **[randomness in ethereum](random_numbers.md)**
 * **[code injection via `delegatecall`](delegatecall)**
+* **[unchecked math](unchecked_math.md)**
 * **[ddos attacks](ddos.md)**
 * **[nonce reuse](nonce)**
 
 
+<br>
+
 ----
 
 ### resources