diff --git a/contracts/token/ERC20Token.sol b/contracts/token/ERC20Token.sol
index 63678ea..ff8de15 100644
--- a/contracts/token/ERC20Token.sol
+++ b/contracts/token/ERC20Token.sol
@@ -4,36 +4,48 @@ pragma solidity ^0.4.23;
 // https://github.com/ethereum/EIPs/issues/20
 
 interface ERC20Token {
-  
-    /// @notice send `_value` token to `_to` from `msg.sender`
-    /// @param _to The address of the recipient
-    /// @param _value The amount of token to be transferred
-    /// @return Whether the transfer was successful or not
+
+    /**
+     * @notice send `_value` token to `_to` from `msg.sender`
+     * @param _to The address of the recipient
+     * @param _value The amount of token to be transferred
+     * @return Whether the transfer was successful or not
+     */
     function transfer(address _to, uint256 _value) external returns (bool success);
 
-    /// @notice `msg.sender` approves `_spender` to spend `_value` tokens
-    /// @param _spender The address of the account able to transfer the tokens
-    /// @param _value The amount of tokens to be approved for transfer
-    /// @return Whether the approval was successful or not
+    /**
+     * @notice `msg.sender` approves `_spender` to spend `_value` tokens
+     * @param _spender The address of the account able to transfer the tokens
+     * @param _value The amount of tokens to be approved for transfer
+     * @return Whether the approval was successful or not
+     */
     function approve(address _spender, uint256 _value) external returns (bool success);
 
-    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
-    /// @param _from The address of the sender
-    /// @param _to The address of the recipient
-    /// @param _value The amount of token to be transferred
-    /// @return Whether the transfer was successful or not
+    /**
+     * @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
+     * @param _from The address of the sender
+     * @param _to The address of the recipient
+     * @param _value The amount of token to be transferred
+     * @return Whether the transfer was successful or not
+     */
     function transferFrom(address _from, address _to, uint256 _value) external returns (bool success);
 
-    /// @param _owner The address from which the balance will be retrieved
-    /// @return The balance
+    /**
+     * @param _owner The address from which the balance will be retrieved
+     * @return The balance
+     */
     function balanceOf(address _owner) external view returns (uint256 balance);
 
-    /// @param _owner The address of the account owning tokens
-    /// @param _spender The address of the account able to transfer the tokens
-    /// @return Amount of remaining tokens allowed to spent
+    /**
+     * @param _owner The address of the account owning tokens
+     * @param _spender The address of the account able to transfer the tokens
+     * @return Amount of remaining tokens allowed to spent
+     */
     function allowance(address _owner, address _spender) external view returns (uint256 remaining);
 
-    /// total amount of tokens
+    /**
+     * @notice return total supply of tokens
+     */
     function totalSupply() external view returns (uint256 supply);
 
     event Transfer(address indexed _from, address indexed _to, uint256 _value);