diff --git a/pycen/__init__.py b/pycen/__init__.py
index e8c57bb..f0fa7c7 100644
--- a/pycen/__init__.py
+++ b/pycen/__init__.py
@@ -8,7 +8,7 @@ from .pers import pers
 from .sites import sites
 from .ps import *
 from .ref import *
-from .params import con,con_sicen,con_bdcen,con_fon,con_gn
+from .params import con,con_sicen,con_bdcen,con_fon,con_gn,con_cad,con_rho