diff --git a/api/server-server/definitions/unsigned_pdu.yaml b/api/server-server/definitions/unsigned_pdu.yaml
index ab6e5b1c..f042dffb 100644
--- a/api/server-server/definitions/unsigned_pdu.yaml
+++ b/api/server-server/definitions/unsigned_pdu.yaml
@@ -82,7 +82,9 @@ properties:
     example: 12
   auth_events:
     type: array
-    description: Event IDs and hashes for the "auth events" of this event.
+    description: |-
+      An event reference list containing the authorization events that would
+      allow this event to be in the room.
     items:
       type: array
       maxItems: 2