diff --git a/sytest-whitelist b/sytest-whitelist
index d5b4feaf6..c022b16c3 100644
--- a/sytest-whitelist
+++ b/sytest-whitelist
@@ -283,3 +283,4 @@ Outbound federation can backfill events
 Inbound federation can backfill events
 Backfill checks the events requested belong to the room
 Backfilled events whose prev_events are in a different room do not allow cross-room back-pagination
+Outbound federation can request missing events