doc fix

README.md

@@ -33,7 +33,7 @@ G3N was only tested with Go1.7.4+
 # Installation
 
 The following command will download the engine and all its dependencies, compile and
-install the packages. Make sure your GOPATH is set.
+install the packages. Make sure your GOPATH is set correctly. 
 
 `go get -u github.com/g3n/engine/...`