diff --git a/event-schemas/schema/m.forwarded_room_key b/event-schemas/schema/m.forwarded_room_key
index 3b1c5900..f0beed2b 100644
--- a/event-schemas/schema/m.forwarded_room_key
+++ b/event-schemas/schema/m.forwarded_room_key
@@ -4,7 +4,8 @@ allOf:
 
 description: |-
   This event type is used to forward keys for end-to-end encryption. Typically
-  it is encrypted as an ``m.room.encrypted`` event.
+  it is encrypted as an ``m.room.encrypted`` event, then sent as a `to-device`_
+  event.
 properties:
   content:
     properties: