diff --git a/cnam/travaux/mémoire/build.py b/cnam/travaux/mémoire/build.py
index c3534ed..2ccbd62 100755
--- a/cnam/travaux/mémoire/build.py
+++ b/cnam/travaux/mémoire/build.py
@@ -41,7 +41,7 @@ def build(directory, sign):
             # prepare build command
             command = ['xelatex',
                        '-output-directory', tmp,
-                       MAIN,
+                       f'\def\mainlanguage{{{language}}}\input{{{MAIN}}}',
                        ]
             # if it's the main document
             if document[ENGLISH] == 'thesis':
diff --git a/cnam/travaux/mémoire/thesis/main.tex b/cnam/travaux/mémoire/thesis/main.tex
index eaacd90..22d979d 100644
--- a/cnam/travaux/mémoire/thesis/main.tex
+++ b/cnam/travaux/mémoire/thesis/main.tex
@@ -1,7 +1,10 @@
+% apply settings
 \input{settings}
 
+% begin document
 \begin{document}
 
 …
 
+% end document
 \end{document}
diff --git a/cnam/travaux/mémoire/thesis/settings.tex b/cnam/travaux/mémoire/thesis/settings.tex
index cb1a5cf..03efefe 100644
--- a/cnam/travaux/mémoire/thesis/settings.tex
+++ b/cnam/travaux/mémoire/thesis/settings.tex
@@ -1 +1,8 @@
+% set default size and document class
 \documentclass[12pt]{extarticle}
+
+% handle multiple languages
+\usepackage{polyglossia}
+
+% set main language
+\setmainlanguage{\mainlanguage}