diff --git a/web/README b/web/README
index 7ddf463..ae08682 100644
--- a/web/README
+++ b/web/README
@@ -10,6 +10,7 @@
 DBName="titanexample"
 
 2> install Flask python library (apt-get install python-flask)
+MacOS: sudo pip install Flask
 
 3> Run from commandline