diff --git a/_episodes/04-data-types-and-format.md b/_episodes/04-data-types-and-format.md
index 5aa587912..0d7079699 100644
--- a/_episodes/04-data-types-and-format.md
+++ b/_episodes/04-data-types-and-format.md
@@ -321,7 +321,7 @@ This is a convenient place to highlight that the `apply` method is one way to ru
 the Buoy Station Names, we can write:
 
 ~~~
-waves_df["Names"].apply(len)
+waves_df["Name"].apply(len)
 ~~~
 {: .language-python}