diff --git a/book.tex b/book.tex
index c3667b1..07a3398 100644
--- a/book.tex
+++ b/book.tex
@@ -1,7 +1,7 @@
 \documentclass{book}
 \usepackage{hyperref}
 \usepackage{titleps}
-
+\usepackage{babel}
 
 \providecommand{\tightlist}{%
   \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}