diff --git a/Installation.md b/Installation.md
index 7e0274d..fd41b96 100644
--- a/Installation.md
+++ b/Installation.md
@@ -37,6 +37,6 @@ $ go get -u github.com/kataras/iris/v12@master
 
 ## Troubleshooting
 
-If you get a network error during installation please make sure you set a valid [GOPROXY environment variable](https://github.com/golang/go/wiki/Modules#are-there-always-on-module-repositories-and-enterprise-proxies) e.g. `GOPROXY=https://goproxy.io` or `GOPROXY=https://goproxy.cn`.
+If you get a network error during installation please make sure you set a valid [GOPROXY environment variable](https://github.com/golang/go/wiki/Modules#are-there-always-on-module-repositories-and-enterprise-proxies) e.g. `GOPROXY=https://goproxy.cn` or `GOPROXY=https://gocenter.io` or `GOPROXY=https://goproxy.io`.
 
 Continue by reading our [[Getting Started]] tutorial.