diff --git a/mavlink/modules/flight_controller.py b/mavlink/modules/flight_controller.py
index ccae179..e1af0bc 100644
--- a/mavlink/modules/flight_controller.py
+++ b/mavlink/modules/flight_controller.py
@@ -176,6 +176,16 @@ def upload_land_command(self, latitude: float, longitude: float) -> bool:
     def is_drone_destination_final_waypoint(self) -> "tuple[bool, bool | None]":
         """
         Returns if the drone's destination is the final waypoint in the mission.
+
+        Returns
+        -------
+        tuple[bool, bool | None]
+            The first boolean in the tuple represents if retrieving the mission
+            information is successful.
+            - If it is not successful, the second parameter will be None.
+            - If it is successful, the second parameter will be a boolean
+              indicating if the drone's destination is set to the final
+              waypoint in the mission.
         """
         waypoint_count = self.drone.commands.count
         current_waypoint = self.drone.commands.next
diff --git a/mavlink/test_mission_ended.py b/mavlink/test_mission_ended.py
index fe2fa46..1daa04a 100644
--- a/mavlink/test_mission_ended.py
+++ b/mavlink/test_mission_ended.py
@@ -34,8 +34,8 @@ def upload_mission(controller: flight_controller.FlightController,
     ----------
     controller: "flight_controller.FlightController"
     waypoints: "list[tuple[float, float, float]]"
-        The three values in the tuple represent latitude (degrees),
-        longitude (degrees), and altitude (metres) respectively.
+        The three values in the tuple represent latitude (decimal degrees),
+        longitude (decimal degrees), and altitude (metres) respectively.
 
     Returns
     -------