Update README.md
diff --git a/README.md b/README.md
index 15cdc61..296636c 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@
## Installation
```
-go get -u github.com/FiloSottile/gvt
+GO15VENDOREXPERIMENT=1 go get -u github.com/FiloSottile/gvt
```
## Usage
@@ -79,7 +79,7 @@
* no GO15VENDOREXPERIMENT support: old tools are based on import path rewriting or GOPATH overrides
* requirement to run on clients: some require the user to install the tool and run it after cloning, which breaks `go get`
- * **no real fetching support**: tools like Godep just copy packages from your GOPATH, instead of pulling it from the Internet
+ * **no real fetching support**: tools like Godep just copy packages from your GOPATH, instead of pulling it from the Internet, contaminating your system environment
* prominent metadata files: there's no need for the manifest to be in your repository root, or in its own empty folder, or to be manually edited
* complex feature set: many are project management tools with included vendoring features
* different build stack: gb-vendor is awesome but it requires you to build your project with gb
