diff --git a/book/3-classification.tex b/book/3-classification.tex
index 0cdbfe5..0905768 100644
--- a/book/3-classification.tex
+++ b/book/3-classification.tex
@@ -378,7 +378,7 @@ \subsection{Precision}
         \node[inner sep=2pt, font=\Large] (a) {
             {
                 $\displaystyle
-                Precision = \frac{{\color{nmlcyan}TP}}{{\color{nmlred}TP} + {\color{nmlpurple}FP}}
+                Precision = \frac{{\color{nmlcyan}TP}}{{\color{nmlcyan}TP} + {\color{nmlpurple}FP}}
                 $
             }
         };