diff --git a/paas2/esb/components/bk/apisv2/usermanage/usermanage_component.py b/paas2/esb/components/bk/apisv2/usermanage/usermanage_component.py
index 0519333c1..8933be710 100644
--- a/paas2/esb/components/bk/apisv2/usermanage/usermanage_component.py
+++ b/paas2/esb/components/bk/apisv2/usermanage/usermanage_component.py
@@ -30,6 +30,8 @@ def handle(self):
 
         request_info = self.get_request_info(extra_params=extra_params)
 
+        # bk-user 要求 app_code 不能为空，而 cmsi tools 调用此组件时，未传递 app_code,
+        # 为更好地兼容 cmsi 作为自定义组件的场景，值为空时替换为网关的 app_code
         if not self.request.app_code:
             self.request.app_code = getattr(settings, "BK_APP_CODE", "")