diff --git a/book/binary/chapter.tex b/book/binary/chapter.tex
index d4b2a32..6de18a1 100644
--- a/book/binary/chapter.tex
+++ b/book/binary/chapter.tex
@@ -688,7 +688,7 @@ An example showing the subtraction of two {\em signed} binary numbers: $-4-8 = -
 
   1   1  1  1  1  1  1  1  1 <== carries
       1  1  1  1  1  1  0  0 <== -4
-    + 1  1  1  1  0  1  1  1 <== one's complement of -8
+    + 1  1  1  1  0  1  1  1 <== one's complement of 8
     ------------------------
   1   1  1  1  1  0  1  0  0 <== -12
 \end{verbatim}