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-rw-r--r--newgrf_callbacks.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/newgrf_callbacks.h b/newgrf_callbacks.h
index d7a91c04b..a52455a7c 100644
--- a/newgrf_callbacks.h
+++ b/newgrf_callbacks.h
@@ -45,6 +45,9 @@ enum CallbackID {
/* Called when the player (or AI) tries to start or stop a vehicle. Mainly
* used for preventing a vehicle from leaving the depot. */
CBID_VEHICLE_START_STOP_CHECK = 0x31,
+
+ /* Called to play a special sound effect */
+ CBID_VEHICLE_SOUND_EFFECT = 0x33,
};
/**