diff --git a/src/newgrf_animation_type.h b/src/newgrf_animation_type.h
--- a/src/newgrf_animation_type.h
+++ b/src/newgrf_animation_type.h
@@ -46,11 +46,11 @@ enum IndustryAnimationTrigger {
 
 /** Animation triggers for airport tiles */
 enum AirpAnimationTrigger {
-	AAT_BUILT,               ///< Triggered when the airport it build (for all tiles at the same time).
+	AAT_BUILT,               ///< Triggered when the airport is built (for all tiles at the same time).
 	AAT_TILELOOP,            ///< Triggered in the periodic tile loop.
 	AAT_STATION_NEW_CARGO,   ///< Triggered when new cargo arrives at the station (for all tiles at the same time).
 	AAT_STATION_CARGO_TAKEN, ///< Triggered when a cargo type is completely removed from the station (for all tiles at the same time).
-	AAT_STATION_250_ticks,   ///< Triggered every 250 ticks (for all tiles at the same time).
+	AAT_STATION_250_TICKS,   ///< Triggered every 250 ticks (for all tiles at the same time).
 };
 
 #endif /* NEWGRF_ANIMATION_TYPE_H */