diff --git a/commun/commun.sty b/commun/commun.sty
index 587a654..fda38f2 100644
--- a/commun/commun.sty
+++ b/commun/commun.sty
@@ -54,6 +54,7 @@
 \RequirePackage{xcolor}
 \RequirePackage[framemethod=tikz]{mdframed}
 \RequirePackage{graphicx}
+\RequirePackage{transparent}
 
 % maths
 \RequirePackage{amsmath}