diff --git a/README.md b/README.md
index 1dbc25b9..646ea8c5 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ If you'd like to just run the stream, clone this repo. The stream will handle in
 /ngen-datastream/scripts/stream.sh /ngen-datastream/configs/conf_datastream_daily.json
 ```
 requires `jq` and `wget`
+also requires `pip install pytz`
 
 ### Example `conf_datastream.json`
 ```