diff --git a/README.md b/README.md
index 07914ad..f8468de 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ it's written in [perl](http://www.perl.org/) and needs only [curl](http://curl.h
 ## install
 
     sudo curl https://raw2.github.com/troydm/exp/master/exp -o /usr/local/bin/exp
+    sudo chmod +x /usr/local/bin/exp
 
 ## usage