diff --git a/pytriqs/operators/operators2_desc.py b/pytriqs/operators/operators2_desc.py
index 09096a6a..ba49f589 100644
--- a/pytriqs/operators/operators2_desc.py
+++ b/pytriqs/operators/operators2_desc.py
@@ -1,5 +1,12 @@
 from wrap_generator import *
 
+# The many_body_operators module
+module = module_(full_name = "pytriqs.operators.operators2", doc = "Doc to be written")
+module.add_include("<triqs/operators/many_body_operator.hpp>")
+module.add_include("<triqs/arrays.hpp>")
+module.add_using("namespace triqs::utility")
+
+
 # The operator class
 op = class_(
         py_type = "Operator",
@@ -10,12 +17,8 @@ op = class_(
         )
 
 op.add_constructor(signature="()", doc="create zero operator")
+op.add_method("bool is_zero()", doc = "Boolean : is the operator null ?")
 
-# The many_body_operators module
-module = module_(full_name = "pytriqs.operators.operators2", doc = "Doc to be written")
-module.add_include("<triqs/operators/many_body_operator.hpp>")
-module.add_include("<triqs/arrays.hpp>")
-module.add_using("namespace triqs::utility")
 module.add_class(op)
 
 # Add various overload of c, c_dag to the module Annihilation & Creation operators