diff --git a/binding/nginx/README.md b/binding/nginx/README.md
index fa2304d..9aa1bd0 100644
--- a/binding/nginx/README.md
+++ b/binding/nginx/README.md
@@ -17,7 +17,7 @@ $ make install
 
 ## nginx conf
 
-> Syntax:  `ip2region_db xdb_file_path [cache_policy 可选]`;
+> Syntax:  `ip2region_db xdb_file_path [cache_policy Optional]`;
 > Context: http
 
 cache_policy: `file` or `vectorIndex` or `content`, default: `content`