diff --git a/keyserver/internal/device_list_update.go b/keyserver/internal/device_list_update.go
index ec7dff56..c4b098a4 100644
--- a/keyserver/internal/device_list_update.go
+++ b/keyserver/internal/device_list_update.go
@@ -222,7 +222,8 @@ func (u *DeviceListUpdater) worker(ch chan gomatrixserverlib.ServerName) {
 	// last made a request to the server. If we get the server name during the cooloff
 	// period, we'll ignore the poke.
 	lastProcessed := make(map[gomatrixserverlib.ServerName]time.Time)
-	cooloffPeriod := time.Minute
+	// this can't be too long else sytest will give up trying to do a test
+	cooloffPeriod := 500 * time.Millisecond
 	shouldProcess := func(srv gomatrixserverlib.ServerName) bool {
 		// we should process requests when now is after the last process time + cooloff
 		return time.Now().After(lastProcessed[srv].Add(cooloffPeriod))
diff --git a/sytest-whitelist b/sytest-whitelist
index a726e51e..4c18775b 100644
--- a/sytest-whitelist
+++ b/sytest-whitelist
@@ -139,6 +139,9 @@ Get left notifs for other users in sync and /keys/changes when user leaves
 Local device key changes get to remote servers
 Local device key changes get to remote servers with correct prev_id
 Server correctly handles incoming m.device_list_update
+Device deletion propagates over federation
+If remote user leaves room, changes device and rejoins we see update in sync
+If remote user leaves room, changes device and rejoins we see update in /keys/changes
 Can add account data
 Can add account data to room
 Can get account data without syncing