diff --git a/contracts/libraries/logic/ReserveLogic.sol b/contracts/libraries/logic/ReserveLogic.sol
index 2f8b668a..1e5268ad 100644
--- a/contracts/libraries/logic/ReserveLogic.sol
+++ b/contracts/libraries/logic/ReserveLogic.sol
@@ -116,6 +116,12 @@ library ReserveLogic {
     return cumulated;
   }
 
+  /**
+   * @dev returns an address of the debt token used for particular interest rate mode on asset.
+   * @param reserve the reserve object
+   * @param interest rate mode - STABLE or VARIABLE from ReserveLogic.InterestRateMode enum
+   * @return an address of the corresponding debt token from reserve configuration
+   **/
   function getDebtTokenAddress(ReserveLogic.ReserveData storage reserve, uint256 interestRateMode)
     internal
     view