diff --git a/src/ai/api/ai_changelog.hpp b/src/ai/api/ai_changelog.hpp
--- a/src/ai/api/ai_changelog.hpp
+++ b/src/ai/api/ai_changelog.hpp
@@ -29,6 +29,8 @@
  * \li WaypointID was replaced by StationID. All WaypointIDs from previous
  *     savegames are invalid
  * \li WAYPOINT_INVALID is now deprecated, use STATION_INVALID instead
+ * \li AISubsidy::GetSource and AISubsidy::GetDestination return STATION_INVALID
+ *     for awarded subsidies
  * \li AIs can create subclasses of API classes and use API constants as part
  *     of their own constants
  * \li AIVehicleList_Station now also works for waypoints