diff --git a/.last-synced-sha b/.last-synced-sha
index b684de6..3233db7 100644
--- a/.last-synced-sha
+++ b/.last-synced-sha
@@ -1 +1 @@
-83c2aa3f491df16ee80a602195c5e21757fd5334
+9961670bf2d881e03da1bdc73bf5b8af7b47f994
diff --git a/spec/open-api-spec.yaml b/spec/open-api-spec.yaml
index 721a09d..c514ac8 100644
--- a/spec/open-api-spec.yaml
+++ b/spec/open-api-spec.yaml
@@ -26093,6 +26093,16 @@ components:
             The timestamp when the entry was approved, or null if not yet
             approved.
           example: null
+        additional_fields:
+          type: object
+          additionalProperties:
+            type: string
+          description: >-
+            Additional fields submitted when the user joined the waitlist.
+            Values are user-provided — treat them as untrusted input when
+            rendering or exporting.
+          example:
+            company: Example Corp
         waitlist_id:
           type:
             - string