diff --git a/docs/development/proxy4shell-terminal.md b/docs/development/proxy4shell-terminal.md
index 81947e11..68a682c4 100644
--- a/docs/development/proxy4shell-terminal.md
+++ b/docs/development/proxy4shell-terminal.md
@@ -68,11 +68,11 @@ $ vim ~/.zshrc
 # session proxy switch shortcut
 function proxy_on() {
     export http_proxy=http://127.0.0.1:7890
-    export https_proxy=\$http_proxy
+    export https_proxy=$http_proxy
     echo -e "global proxy for the current terminal session has turned on"
 }
 
-function proxy_off(){
+function proxy_off() {
     unset http_proxy https_proxy
     echo -e "global proxy for the current terminal session has turned off"
 }