EVM-C: mention that the client frees the buffer in get_code_fn
@@ -308,9 +308,10 @@ typedef void (*evm_get_balance_fn)(struct evm_uint256be* result,
///
/// This callback function is used by an EVM to get the code of a contract of
/// given address.
+///
/// @param[out] result_code The pointer to the contract code. This argument is
/// optional. If NULL is provided, the host MUST only
-/// return the code size.
+/// return the code size. It will be freed by the Client.
/// @param context The pointer to the Host execution context.
/// @see ::evm_context.
/// @param address The address of the contract.
