diff --git a/book/book.tex b/book/book.tex
index 2e10f04..ba79b1b 100644
--- a/book/book.tex
+++ b/book/book.tex
@@ -1644,7 +1644,7 @@ \section{String operations}
 if the strings look like numbers, so the following are illegal:
 
 \begin{verbatim}
-'2'-'1'    'eggs'/'easy'    'third'*'a charm'
+'chinese'-'food'    'eggs'/'easy'    'third'*'a charm'
 \end{verbatim}
 %
 But there are two exceptions, {\tt +} and {\tt *}.