diff --git a/book/book.tex b/book/book.tex
index d9d0080c..64708638 100644
--- a/book/book.tex
+++ b/book/book.tex
@@ -929,7 +929,7 @@ \section{Bayes Tables}
 
 You can write a Bayes table on paper or use a spreadsheet, but for this example I'll use a Pandas DataFrame.
 
-First I'll make empty DataFrame with one row for each hypothesis:
+First I'll make an empty DataFrame with one row for each hypothesis:
 
 \begin{code}
 import pandas as pd