diff --git a/README.rst b/README.rst
index 9774d451..bd50aa1d 100644
--- a/README.rst
+++ b/README.rst
@@ -14,6 +14,7 @@ How do I install this package?
 
     git clone https://github.com/Knowledge-Graph-Hub/kg-covid-19
     cd kg-covid-19
+    which python3.7 # python3.7 is required
     pip install .
     pip install -r requirements.txt