Update add-token-pair.md

gnosis · May 22, 2019 · 882beb1 · 882beb1
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 # Add a token pair
 The DutchX is an open protocol, and as such, anybody can add a token pair to trade.
 
+**IMPORTANT NOTE** Make sure the token you are adding is in fact an ERC20 token - the protocol does not double check. Only ERC20 tokens are tradable!
+
 There are several ways to add a token pair to the DutchX. All of them end up
 using the `addTokenPair` function in the
 [**DutchExchange.sol**](https://github.com/gnosis/dx-contracts/blob/master/contracts/DutchExchange.sol)