diff --git a/src/ai/api/ai_station.hpp b/src/ai/api/ai_station.hpp
index 825c0f3ee3..0faaaf1471 100644
--- a/src/ai/api/ai_station.hpp
+++ b/src/ai/api/ai_station.hpp
@@ -117,7 +117,8 @@ public:
 
 	/**
 	 * Find out if this station is within the rating influence of a town.
-	 *  Stations within the radius influence the rating of the town.
+	 *  The service quality of stations with signs within this radius
+	 *  influences the rating of the town.
 	 * @param station_id The station to check.
 	 * @param town_id The town to check.
 	 * @return True if the tile is within the rating influence of the town.
diff --git a/src/ai/api/ai_tile.hpp b/src/ai/api/ai_tile.hpp
index 17a292ae3e..557305b404 100644
--- a/src/ai/api/ai_tile.hpp
+++ b/src/ai/api/ai_tile.hpp
@@ -441,7 +441,8 @@ public:
 
 	/**
 	 * Find out if this tile is within the rating influence of a town.
-	 *  Stations on this tile influence the rating of the town.
+	 *  If a station sign would be on this tile, the servicing quality of the station would
+	 *  influence the rating of the town.
 	 * @param tile The tile to check.
 	 * @param town_id The town to check.
 	 * @return True if the tile is within the rating influence of the town.
diff --git a/src/ai/api/ai_town.hpp b/src/ai/api/ai_town.hpp
index 375dd2a61e..f74dc70f3f 100644
--- a/src/ai/api/ai_town.hpp
+++ b/src/ai/api/ai_town.hpp
@@ -209,7 +209,8 @@ public:
 
 	/**
 	 * Find out if this tile is within the rating influence of a town.
-	 *  Stations on this tile influence the rating of the town.
+	 *  If a station sign would be on this tile, the servicing quality of the station would
+	 *  influence the rating of the town.
 	 * @param town_id The town to check.
 	 * @param tile The tile to check.
 	 * @pre IsValidTown(town_id).