diff --git a/commun/commun.sty b/commun/commun.sty
index 5dcc1ac..35958ec 100644
--- a/commun/commun.sty
+++ b/commun/commun.sty
@@ -31,7 +31,7 @@
 \RequirePackage{pgfplots}
 \RequirePackage[amssymb, squaren, pstricks]{SIunits}
 \RequirePackage{asymptote}
-% \RequirePackage{cancel}
+\RequirePackage{mathrsfs}
 
 % programmation
 \RequirePackage{xifthen}