diff --git a/inst/chapters/03_Data_Pre_Processing.R b/inst/chapters/03_Data_Pre_Processing.R
index 9d92d26..6f9396a 100644
--- a/inst/chapters/03_Data_Pre_Processing.R
+++ b/inst/chapters/03_Data_Pre_Processing.R
@@ -89,6 +89,7 @@ histogram(~segTrainTrans$PerimCh1,
 ## R's prcomp is used to conduct PCA
 pr <- prcomp(~ AvgIntenCh1 + EntropyIntenCh1, 
              data = segTrainTrans, 
+             center = TRUE,
              scale. = TRUE)
 
 transparentTheme(pchSize = .7, trans = .3)