1 files changed, 1 insertions, 1 deletions
diff --git a/openttd.h b/openttd.h
index 087c3e4c7..29d9d0c9d 100644
--- a/openttd.h
+++ b/openttd.h
@@ -42,7 +42,7 @@ typedef uint16 IndustryID;
 typedef uint16 DepotID;
 typedef uint16 WaypointID;
 typedef byte PlayerID;
-typedef byte OrderID;
+typedef byte VehicleOrderID;  ///< The index of an order within its current vehicle (not pool related)
 typedef byte CargoID;
 typedef byte LandscapeID;
 typedef uint16 StringID;