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-rw-r--r--src/ai/api/ai_airport.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ai/api/ai_airport.hpp b/src/ai/api/ai_airport.hpp
index a058209c6..a889b3289 100644
--- a/src/ai/api/ai_airport.hpp
+++ b/src/ai/api/ai_airport.hpp
@@ -180,6 +180,7 @@ public:
* built at this tile.
* @param tile The tile to check.
* @param type The AirportType to check.
+ * @pre IsAirportInformationAvailable(type).
* @return The amount of noise added to the nearest town.
* @note The noise will be added to the town with TownID GetNearestTown(tile, type).
*/