diff --git a/451-Signal_Image/Cours/main.tex b/451-Signal_Image/Cours/main.tex
index 8ba7fe06b7baf7b9fd13006088dbf0739a1ca845..488299160435b900c0d1706bcaf7833646408314 100644
--- a/451-Signal_Image/Cours/main.tex
+++ b/451-Signal_Image/Cours/main.tex
@@ -1,7 +1,7 @@
 \documentclass[openany]{../../cours}
 \usepackage{../../raccourcis}
 \usepackage{bbold} % indicatrice
-
+\usetikzlibrary{patterns}
 % Mise en page
 \title{Notes de Cours}
 \author{Pierre-Antoine Comby}