diff --git a/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol b/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol
index ace1dc45490..11da61c08c7 100644
--- a/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol
+++ b/packages/protocol/contracts-0.8/stability/FeeCurrencyAdapter.sol
@@ -39,6 +39,7 @@ contract FeeCurrencyAdapter is Initializable, CalledByVm, IFeeCurrencyAdapter {
    * @param _name The name of the adapted token.
    * @param _symbol The symbol of the adapted token.
    * @param _expectedDecimals The expected number of decimals of the adapted token.
+   * @notice _expectedDecimals must be bigger than _adaptedToken.decimals().
    */
   function initialize(
     address _adaptedToken,