diff --git a/openapi/components/schemas/CalendarEvent.yaml b/openapi/components/schemas/CalendarEvent.yaml
index 5b8b9708..88b32530 100644
--- a/openapi/components/schemas/CalendarEvent.yaml
+++ b/openapi/components/schemas/CalendarEvent.yaml
@@ -45,18 +45,29 @@ properties:
     description: Languages that might be spoken at this event
     items:
       $ref: ./LanguageCode.yaml
+  occurrenceKind:
+    type: string
+    description: So far if it exists, always the string "single"
   ownerId:
     $ref: ./GroupID.yaml
   platforms:
     type: array
     items:
       $ref: ./CalendarEventPlatform.yaml
+  recurrence:
+    type: string
+    description: So far unused, always "null"
+    nullable: true
   roleIds:
     type: array
     description: Group roles that may join this event
     nullable: true
     items:
       $ref: ./GroupRoleID.yaml
+  seriesId:
+    type: string
+    description: So far unused, always "null"
+    nullable: true
   startsAt:
     type: string
     format: date-time