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-rw-r--r--src/newgrf_callbacks.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/newgrf_callbacks.h b/src/newgrf_callbacks.h
index fefd4f27f..e62523a60 100644
--- a/src/newgrf_callbacks.h
+++ b/src/newgrf_callbacks.h
@@ -13,6 +13,9 @@
* bit is set in the callback flags/trigger for a vehicle, house,
* industry, etc.
* Names are formatted as CBID_<CLASS>_<CALLBACK>
+ *
+ * @note Do not forget to add 15 bits callbacks to the switch in
+ * newgrf_spritegroup.cpp (search for "15 bits callback").
*/
enum CallbackID {
/** Set when using the callback resolve system, but not to resolve a callback. */