Update README.md

Co-authored-by: Romain Milon <[email protected]>
Signed-off-by: Reppelin Tom <[email protected]>

Author: tomrpl

README.md

@@ -20,7 +20,7 @@ This oracle handles the following cases among others (let's say that our pair is
 
 ## WstETH/stETH Exchange Rate Adapter
 
-A specific implementation, the `WstEthStEthExchangeRateChainlinkAdapter`, provides the exchange rate between wstETH and stETH.
+A specific implementation, the `WstEthStEthExchangeRateChainlinkAdapter`, provides the exchange rate between wstETH and stETH as a Chainlink-interface-compliant feed.
 
 Deployed on Ethereum Mainnet, this adapter can be found on Ethereum Mainnet at the address [0x905b7dAbCD3Ce6B792D874e303D336424Cdb1421](https://etherscan.io/address/0x905b7dabcd3ce6b792d874e303d336424cdb1421#code).