diff --git a/README.md b/README.md
index b9ab39f..969e59b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,13 @@
+resty里请求域名地址时无法使用本地的`/etc/hosts`文件，需在`nginx.conf`文件中的`http`模块内添加`resolver`配置显式指定：
+
+```nginx
+http {
+    ...
+    resolver 8.8.8.8;
+    ...
+}
+```
+
 put `upload.lua` into:
 
 ```bash