diff --git a/cnam/thesis/thesis/problem/index.tex b/cnam/thesis/thesis/problem/index.tex
index 90cba6a..6ed18a5 100644
--- a/cnam/thesis/thesis/problem/index.tex
+++ b/cnam/thesis/thesis/problem/index.tex
@@ -1,6 +1,12 @@
 \ml
-{\chapter{Problem: maintenance of operating systems}}
-{\chapter{Problématique : maintenance des systèmes d’exploitation}}
+{\chapter{Problem: maintain operating systems}}
+{\chapter{Problématique : maintenir des systèmes d’exploitation}}
+
+\ml
+{Depending on the different use cases,
+maintaining operating systems leads to thinking about:}
+{En fonction des cas d’utilisation,
+maintenir des systèmes d’exploitation mène à penser :}
 
 \begin{itmz}
 \item{\ml{updates}