diff --git a/Solidity-Expert/Token-standards/README.md b/Solidity-Expert/Token-standards/README.md
index 0ca6ffd..800237b 100644
--- a/Solidity-Expert/Token-standards/README.md
+++ b/Solidity-Expert/Token-standards/README.md
@@ -2,4 +2,13 @@
 
 <br>
 
+### [ERC20](https://github.com/bt3gl-labs/Blockchain-Hacking-Toolkit/blob/main/Solidity-Expert/Token-standards/erc20.md)
+
 * In the case of ERC20, a transaction sending ether to an address changes the state of an address. A transaction transferring a token to an address only changes the state of the token contract, not the state of the recipient address.
+
+
+<br>
+
+---
+
+### [ERC777](https://github.com/bt3gl-labs/Blockchain-Hacking-Toolkit/blob/main/Solidity-Expert/Token-standards/erc777.md)