diff --git a/data/event-schemas/schema/m.room.join_rules.yaml b/data/event-schemas/schema/m.room.join_rules.yaml
index d5f8eb2d..b6a322c6 100644
--- a/data/event-schemas/schema/m.room.join_rules.yaml
+++ b/data/event-schemas/schema/m.room.join_rules.yaml
@@ -28,6 +28,7 @@ properties:
           - invite
           - private
           - restricted
+          - knock_restricted
         type: string
       allow:
         x-addedInMatrixVersion: "1.2"