diff --git a/book.tex b/book.tex
index 8cb66ef..987d6fc 100644
--- a/book.tex
+++ b/book.tex
@@ -3965,14 +3965,14 @@ \section{Assign Homes}
 \begin{lstlisting}[basicstyle=\ttfamily\footnotesize]
 movq $42, a
 movq a, b
-movq b, %rax
+movq b, %rdi
 \end{lstlisting}
 \compilesto
 %stack-space: 16
 \begin{lstlisting}[basicstyle=\ttfamily\footnotesize]
 movq $42, -8(%rbp)
 movq -8(%rbp), -16(%rbp)
-movq -16(%rbp), %rax
+movq -16(%rbp), %rdi
 \end{lstlisting}
 \end{transformation}
 
@@ -4059,7 +4059,7 @@ \section{Patch Instructions}
 \begin{lstlisting}
     movq $42, -8(%rbp)
     movq -8(%rbp), -16(%rbp)
-    movq -16(%rbp), %rax
+    movq -16(%rbp), %rdi
 \end{lstlisting}
 \fi}
 {\if\edition\pythonEd\pythonColor