diff --git a/manual/deploy_pro/enable_search_and_background_tasks_in_a_cluster.md b/manual/deploy_pro/enable_search_and_background_tasks_in_a_cluster.md
index 7bd5fe0a..e2c17606 100644
--- a/manual/deploy_pro/enable_search_and_background_tasks_in_a_cluster.md
+++ b/manual/deploy_pro/enable_search_and_background_tasks_in_a_cluster.md
@@ -70,6 +70,7 @@ On nodes B and C, you need to:
 
 ```
 [INDEX FILES]
+enabled = true
 external_es_server = true
 es_host = <ip of node A>
 es_port = 9200
@@ -248,6 +249,7 @@ Edit `seafevents.conf`, add the following lines:
 
 ```
 [INDEX FILES]
+enabled = true
 external_es_server = true
 es_host = <ip of node A>
 es_port = 9200