minor edit

book.tex

@@ -4612,11 +4612,11 @@ tag plus \itm{len} times 8.)
      |$v$|) ... )))) ...)
 \end{lstlisting}
 (In the above, we suppressed all of the \code{has-type} forms in the
-output for the sake of readability.)  The ordering of the initializing
-expressions ($e_0,\ldots,e_{n-1}$) prior to the \code{allocate} is
-important, as those expressions may trigger garbage collection and we
-do not want an allocated but uninitialized tuple to be present during
-a garbage collection.
+output for the sake of readability.)  The placement of the initializing
+expressions $e_0,\ldots,e_{n-1}$ prior to the \code{allocate} and
+the sequence of \code{vector-set!}'s is important, as those expressions
+may trigger garbage collection and we do not want an allocated but
+uninitialized tuple to be present during a garbage collection.
 
 The output of \code{expose-allocation} is a language that extends
 $R_3$ with the three new forms that we use above in the translation of