diff --git a/ch4-rpc/ch4-06-grpc-ext.md b/ch4-rpc/ch4-06-grpc-ext.md
index 1f46307..2942fac 100644
--- a/ch4-rpc/ch4-06-grpc-ext.md
+++ b/ch4-rpc/ch4-06-grpc-ext.md
@@ -129,10 +129,8 @@ protoc  \
 	hello.proto
 ```
 
-> windows:
-```
-protoc  --proto_path=%GOPATH%/src --proto_path=%GOPATH%/src/github.com/google/protobuf/src --proto_path=. --govalidators_out=. --go_out=plugins=grpc:. hello.proto
-```
+> windows:替换 `${GOPATH}` 为 `%GOPATH%` 即可.
+
 
 以上的命令会调用protoc-gen-govalidators程序，生成一个独立的名为hello.validator.pb.go的文件：
 
@@ -222,10 +220,7 @@ $ protoc -I/usr/local/include -I. \
 	hello.proto
 ```
 
-> windows:
-```
-protoc -I. -I%GOPATH%/src -I%GOPATH%/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis --grpc-gateway_out=. --go_out=plugins=grpc:. hello.proto
-```
+> windows:替换 `${GOPATH}` 为 `%GOPATH%` 即可.
 
 插件会为RestService服务生成对应的RegisterRestServiceHandlerFromEndpoint函数：