diff --git a/public/openapi/read/topic/topic_id.yaml b/public/openapi/read/topic/topic_id.yaml
index ea163e05b4..e2efbabac2 100644
--- a/public/openapi/read/topic/topic_id.yaml
+++ b/public/openapi/read/topic/topic_id.yaml
@@ -224,6 +224,8 @@ get:
                               type: string
                             count:
                               type: number
+                            hasSingleImmediateReply:
+                              type: boolean
                         selfPost:
                           type: boolean
                         events: