diff --git a/book/binary/chapter.tex b/book/binary/chapter.tex
index f0a062e..2d643ac 100644
--- a/book/binary/chapter.tex
+++ b/book/binary/chapter.tex
@@ -1056,6 +1056,7 @@ left to form a 32-bit number.
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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Shifting}
+\label{shifting}
 
 We were all taught how to multiply and divide decimal numbers by ten
 by moving (or {\em shifting}) the decimal point to the right or left