diff --git a/data/api/client-server/pusher.yaml b/data/api/client-server/pusher.yaml
index 2be7119d..b797bb5a 100644
--- a/data/api/client-server/pusher.yaml
+++ b/data/api/client-server/pusher.yaml
@@ -182,7 +182,9 @@ paths:
                   If the `kind` is `"email"`, this is the email address to
                   send notifications to.
               kind:
-                type: string
+                type:
+                  - "string"
+                  - "null"
                 description: |-
                   The kind of pusher to configure. `"http"` makes a pusher that
                   sends HTTP pokes. `"email"` makes a pusher that emails the