diff --git a/examples/cross_section.py b/examples/cross_section.py
index b98cb2ef4c..cd0b4a6707 100644
--- a/examples/cross_section.py
+++ b/examples/cross_section.py
@@ -50,6 +50,7 @@
 # For this example, we will be plotting potential temperature, relative humidity, and
 # tangential/normal winds. And so, we need to calculate those, and add them to the dataset:
 
+# Temperature is in Kelvin for the NARR dataset
 cross['Potential_temperature'] = mpcalc.potential_temperature(
     cross['isobaric'],
     cross['Temperature']