diff --git a/README.md b/README.md
index f32941b..42d6ad4 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,7 @@ SpecialProxy
     -L 本地代理头域         默认为 "Local"  
     -d DNS查询IP[:端口]     默认为 "114.114.114.114"  
     -s SSL代理字符串        默认为 "CONNECT"  
+    -u                      设置运行uid  
     -a                      对所有HTTP请求重新拼接  
     -h 显示帮助  
     -w 工作进程数  
diff --git a/main.c b/main.c
index 1e4106f..c516464 100644
--- a/main.c
+++ b/main.c
@@ -19,6 +19,7 @@ static void usage()
     "    -L local proxy header                 \033[35G default is 'Local'\n"
     "    -d dns query address                  \033[35G default is " DEFAULT_DNS_IP "\n"
     "    -s ssl proxy string                   \033[35G default is 'CONNECT'\n"
+    "    -u uid                   \033[35G running uid\n"
     "    -a                                    \033[35G all http requests repeat spilce\n"
     "    -h display this infomaction\n"
     "    -w worker process\n");