diff --git a/public/openapi/components/schemas/TopicObject.yaml b/public/openapi/components/schemas/TopicObject.yaml
index 2e5085158f..45114a696b 100644
--- a/public/openapi/components/schemas/TopicObject.yaml
+++ b/public/openapi/components/schemas/TopicObject.yaml
@@ -57,6 +57,14 @@ TopicObject:
           description: An ISO 8601 formatted date string (complementing `lastposttime`)
         votes:
           type: number
+        thumbs:
+          type: array
+          items:
+            type: object
+            properties:
+              url:
+                type: string
+                description: Relative path to the topic thumbnail
         category:
           type: object
           properties:
diff --git a/public/openapi/read/topic/topic_id.yaml b/public/openapi/read/topic/topic_id.yaml
index 67f7ef3096..2dab408fa6 100644
--- a/public/openapi/read/topic/topic_id.yaml
+++ b/public/openapi/read/topic/topic_id.yaml
@@ -46,6 +46,14 @@ get:
                     type: array
                     items:
                       $ref: ../../components/schemas/TagObject.yaml#/TagObject
+                  thumbs:
+                    type: array
+                    items:
+                      type: object
+                      properties:
+                        url:
+                          type: string
+                          description: Relative path to the topic thumbnail
                   posts:
                     type: array
                     items:
diff --git a/public/openapi/read/unread.yaml b/public/openapi/read/unread.yaml
index e2b48faee9..8fa3be8c9c 100644
--- a/public/openapi/read/unread.yaml
+++ b/public/openapi/read/unread.yaml
@@ -35,6 +35,14 @@ get:
                               nullable: true
                             titleRaw:
                               type: string
+                            thumbs:
+                              type: array
+                              items:
+                                type: object
+                                properties:
+                                  url:
+                                    type: string
+                                    description: Relative path to the topic thumbnail
                             category:
                               type: object
                               properties: