edit

book.tex

@@ -605,7 +605,7 @@ programs. The following program simply adds two integers.
 \begin{lstlisting}
    (+ 10 32)
 \end{lstlisting}
-The result is \key{42}, as you might expected. 
+The result is \key{42}, as you might have expected. 
 %
 The next example demonstrates that expressions may be nested within
 each other, in this case nesting several additions and negations.