diff --git a/public/openapi/components/schemas/PostObject.yaml b/public/openapi/components/schemas/PostObject.yaml
index 80c9a06cd3..1d8f2f5b67 100644
--- a/public/openapi/components/schemas/PostObject.yaml
+++ b/public/openapi/components/schemas/PostObject.yaml
@@ -122,6 +122,23 @@ PostObject:
           type: array
           items:
             $ref: ../../components/schemas/TagObject.yaml#/TagObject
+        thumbs:
+          type: array
+          items:
+            type: object
+            properties:
+              id:
+                type: number
+                description: The topic id
+              name:
+                type: string
+                description: The topic thumbnail filename
+              path:
+                type: string
+                description: Path to topic thumbnail without upload_url prefix
+              url:
+                type: string
+                description: Relative path to the topic thumbnail
       required:
         - uid
         - tid