diff --git a/README.txt b/README.txt
index 9438cc3..a27c13b 100644
--- a/README.txt
+++ b/README.txt
@@ -6,6 +6,7 @@ Prerequisites:
 
   # Runtime and build environments
   sudo apt-get install python2.7 python2.7-dev python-setuptools
+  sudo apt-get install python-numpy python-scipy python-matplotlib
 
   nilmdb (1.3.1+)