diff --git a/src/ai/api/ai_order.hpp b/src/ai/api/ai_order.hpp
index f3ccbb32cb..c04ffd7997 100644
--- a/src/ai/api/ai_order.hpp
+++ b/src/ai/api/ai_order.hpp
@@ -404,7 +404,7 @@ public:
 	static bool SetOrderFlags(VehicleID vehicle_id, OrderPosition order_position, AIOrderFlags order_flags);
 
 	/**
-	 * Deprecated, use SetOrderFlags instead.
+	 * @Deprecated, use SetOrderFlags instead.
 	 */
 	static bool ChangeOrder(VehicleID vehicle_id, OrderPosition order_position, AIOrderFlags order_flags);
 
diff --git a/src/ai/api/ai_sign.cpp b/src/ai/api/ai_sign.cpp
index 29609f29ab..66ea4183c7 100644
--- a/src/ai/api/ai_sign.cpp
+++ b/src/ai/api/ai_sign.cpp
@@ -15,6 +15,7 @@
 
 /* static */ SignID AISign::GetMaxSignID()
 {
+	AILog::Warning("AISign::GetMaxSignID is deprecated and will be removed soon, please use AISignList instead.");
 	return (SignID)::Sign::GetPoolSize();
 }
 
diff --git a/src/ai/api/ai_tile.cpp b/src/ai/api/ai_tile.cpp
index f54285477c..93f0bd82ec 100644
--- a/src/ai/api/ai_tile.cpp
+++ b/src/ai/api/ai_tile.cpp
@@ -131,6 +131,7 @@
 
 /* static */ int32 AITile::GetHeight(TileIndex tile)
 {
+	AILog::Warning("AITile::GetHeight is deprecated and will be removed soon, please use GetMinHeight/GetMaxHeight/GetCornerHeight instead.");
 	if (!::IsValidTile(tile)) return -1;
 
 	return ::TileHeight(tile);