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 ## Background
 
-The Polymarket CTF Exchange is an exchange protocol that facilitates atomic swaps between [Conditional Tokens Framework(CTF)](https://docs.gnosis.io/conditionaltokens/) ERC1155 assets and an ERC20 collateral asset.
+The Polymarket CTF Exchange is an exchange protocol that facilitates atomic swaps between [Conditional Tokens Framework(CTF)](https://github.com/gnosis/conditional-tokens-contracts) ERC1155 assets and an ERC20 collateral asset.
 
 It is intended to be used in a hybrid-decentralized exchange model wherein there is an operator that provides offchain matching services while settlement happens on-chain, non-custodially.