diff --git a/public/openapi/read/config.yaml b/public/openapi/read/config.yaml
index 3e91fd759b..946a2bfacd 100644
--- a/public/openapi/read/config.yaml
+++ b/public/openapi/read/config.yaml
@@ -121,6 +121,11 @@ get:
                     type: string
                   link_url:
                     type: string
+              thumbs:
+                type: object
+                properties:
+                  size:
+                    type: number
               acpLang:
                 type: string
               openOutgoingLinksInNewTab: