diff --git a/iso15118/secc/controller/interface.py b/iso15118/secc/controller/interface.py
index 8c1a262b..bb1f42f4 100644
--- a/iso15118/secc/controller/interface.py
+++ b/iso15118/secc/controller/interface.py
@@ -383,8 +383,9 @@ async def stop_charger(self) -> None:
     @abstractmethod
     async def is_contactor_opened(self) -> bool:
         """
-        Sends a command to the SECC to get the contactor status is opened to terminate
-        energy flow
+        This method is used to check if the contactor is open.
+        Used in PowerDelivery when the EV requests to
+        stop energy transfer.
 
         Relevant for:
         - all protocols
@@ -394,7 +395,10 @@ async def is_contactor_opened(self) -> bool:
     @abstractmethod
     async def is_contactor_closed(self) -> Optional[bool]:
         """
-        Sends a command to the SECC to get the contactor status is closed
+        This method is used to check if the contactor is closed.
+        In AC, this method is called in PowerDelivery when the EV requests to
+        start energy transfer.
+        In DC, this method is called during CableCheck.
 
         Relevant for:
         - all protocols