diff --git a/algo-for-fetching-departures-for-stop.md b/algo-for-fetching-departures-for-stop.md
index 5c018995..25f9ea66 100644
--- a/algo-for-fetching-departures-for-stop.md
+++ b/algo-for-fetching-departures-for-stop.md
@@ -29,5 +29,6 @@ struct DepartureArrivalEvent {
     has_realtime: bool,
     trip: gtfs_rt::TripDescriptor,
     is_frequency: bool,
+    platform: Option<String>
 }
 ```
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