diff --git a/book/tutorials/nb-to-package/climate_model.py b/book/tutorials/nb-to-package/climate_model.py
index f3e9b11..6d2e043 100644
--- a/book/tutorials/nb-to-package/climate_model.py
+++ b/book/tutorials/nb-to-package/climate_model.py
@@ -1,3 +1,5 @@
+# Very Simpl Climate Model
+
 import numpy as np
 import matplotlib.pyplot as plt
 from co2_emissions import Constant_CO2, SSPEmissions