diff --git a/README.md b/README.md
index d327e1b698f68d22f44f218a8a5476969ae741cd..476aab2d126e43047be424684e56d993704ee09f 100644
--- a/README.md
+++ b/README.md
@@ -188,7 +188,7 @@ Proceed as follows:
         source ~/.bash_profile    // or ~/.bashrc, of course
         ````
 
-  2. If you are using Eclipse or other GUIs and you want this environment variable to be accessed by them, edit the file `/etc/environment` and add this line:
+  2. If you are using Eclipse or other GUIs and you want this environment variable to be accessed by them, edit the file `/etc/environment` (you need to use `sudo`) and add this line:
   
   `WOLF_ROOT="<your wolf path>" # e.g. /home/jsola/dev/wolf`