diff --git a/README.md b/README.md
index 801319e..7bed8f7 100644
--- a/README.md
+++ b/README.md
@@ -9,5 +9,6 @@ for every theme. But hey, it only has to work one time to get at the data.
 
 It is able to detect attachments and images and tries to download them too.
 
-A working [casperjs](http://casperjs.org/) installation is needed for the stuff to work.
+A working [casperjs](http://casperjs.org/) and [npm](https://www.npmjs.com/) installation is needed 
+for the stuff to work.