diff --git a/examples/orderbook_data/README.md b/examples/orderbook_data/README.md
index c0aadd5c6..059ee2705 100644
--- a/examples/orderbook_data/README.md
+++ b/examples/orderbook_data/README.md
@@ -16,7 +16,7 @@ Current version of script with default value tries to connect localhost **via de
 
 Run following command to install necessary libraries
 ```
-pip install pytest
+pip install pytest coverage
 pip install arctic  # NOTE: pip may fail to resolve the right package dependency !!! Please make sure the dependency are satisfied.
 ```