diff --git a/lib_jl.asy b/lib_jl.asy
index 8db5232..3837b97 100644
--- a/lib_jl.asy
+++ b/lib_jl.asy
@@ -2,6 +2,7 @@ usepackage("amsmath,amssymb");
 usepackage("inputenc","utf8");
 usepackage("icomma");
 usepackage("esvect");
+usepackage("mathrsfs");
 
 import graph_pi;
 import graph3;