diff --git a/book/binary/chapter.tex b/book/binary/chapter.tex
index f82a97f..b6217f0 100644
--- a/book/binary/chapter.tex
+++ b/book/binary/chapter.tex
@@ -955,7 +955,7 @@ the most negative value as shown in \autoref{sum:127+1}.
 \begin{BVerbatim}
    0 1 1 1 1 1 1 1 0 <== carries
      0 1 1 1 1 1 1 1 <== 127
- +   0 0 0 0 1 0 0 1 <== 1
+ +   0 0 0 0 0 0 0 1 <== 1
 ---------------------
      1 0 0 0 0 0 0 0 <== sum = -128
 \end{BVerbatim}