diff --git a/public/openapi/read/topic/topic_id.yaml b/public/openapi/read/topic/topic_id.yaml
index 4b890143f7..2c712f31a0 100644
--- a/public/openapi/read/topic/topic_id.yaml
+++ b/public/openapi/read/topic/topic_id.yaml
@@ -374,6 +374,20 @@ get:
                     type: string
                   postIndex:
                     type: number
+                  author:
+                    type: object
+                    required: [username, uid]
+                    properties:
+                      username:
+                        type: string
+                      userslug:
+                        type: string
+                      uid:
+                        type: number
+                      fullname:
+                        type: string
+                      displayname:
+                        type: string
                   loggedInUser:
                     $ref: ../../components/schemas/UserObject.yaml#/UserObject
               - type: object