diff --git a/contracts/configuration/LendingPoolAddressesProviderRegistry.sol b/contracts/configuration/LendingPoolAddressesProviderRegistry.sol
index 53ef4d10..bf15ef3d 100644
--- a/contracts/configuration/LendingPoolAddressesProviderRegistry.sol
+++ b/contracts/configuration/LendingPoolAddressesProviderRegistry.sol
@@ -20,7 +20,7 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
   /**
    * @dev returns if an addressesProvider is registered or not
    * @param provider the addresses provider
-   * @return true if the addressesProvider is registered, false otherwise
+   * @return The id of the addresses provider or 0 if the addresses provider not registered
    **/
   function isAddressesProviderRegistered(address provider)
     external
@@ -33,7 +33,7 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
 
   /**
    * @dev returns the list of active addressesProviders
-   * @return the list of addressesProviders
+   * @return the list of addressesProviders, potentially containing address(0) elements
    **/
   function getAddressesProvidersList() external override view returns (address[] memory) {
     address[] memory addressesProvidersList = _addressesProvidersList;
@@ -91,7 +91,7 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
 
   /**
    * @dev Returns the id on an `addressesProvider` or address(0) if not registered
-   * @return The id or address(0)
+   * @return The id or 0 if the addresses provider is not registered
    */
   function getAddressesProviderIdByAddress(address addressesProvider)
     external