diff --git a/src/github.com/matrix-org/dendrite/federationapi/routing/missingevents.go b/src/github.com/matrix-org/dendrite/federationapi/routing/missingevents.go
index b62e9919e..2e0f51e73 100644
--- a/src/github.com/matrix-org/dendrite/federationapi/routing/missingevents.go
+++ b/src/github.com/matrix-org/dendrite/federationapi/routing/missingevents.go
@@ -66,6 +66,7 @@ func GetMissingEvents(
 	}
 }
 
+// filterEvents returns only those events with matching roomID and having depth greater than minDepth
 func filterEvents(
 	events []gomatrixserverlib.Event, minDepth int64, roomID string,
 ) []gomatrixserverlib.Event {