diff --git a/content/os/v1.x/en/installation/configuration/write-files/_index.md b/content/os/v1.x/en/installation/configuration/write-files/_index.md
index bc86e0a21ab..3853e2241df 100644
--- a/content/os/v1.x/en/installation/configuration/write-files/_index.md
+++ b/content/os/v1.x/en/installation/configuration/write-files/_index.md
@@ -39,3 +39,5 @@ write_files:
       restrict 127.0.0.1
       restrict [::1]
 ```
+
+> Note: Currently only supports built-in services, the custom services are not applicable.