diff --git a/README.md b/README.md
index 952fdef..1496413 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,10 @@ $ python run_downloader.py -h
 
 
 
+`pip install numpy`
+
+
+
 ### Post download 
 Run the run_downloader.py with the following option: