diff --git a/bfps/DNS.py b/bfps/DNS.py
index 44c1cca1366dca33c846f7bdafef9d1aef2444b0..90988019734e777e8b355eff4cd33763e1f71857 100644
--- a/bfps/DNS.py
+++ b/bfps/DNS.py
@@ -166,6 +166,11 @@ class DNS(_code):
         self.NSVEp_extra_parameters['tracers0_integration_steps'] = int(4)
         self.NSVEp_extra_parameters['tracers0_neighbours'] = int(1)
         self.NSVEp_extra_parameters['tracers0_smoothness'] = int(1)
+        #self.extra_parameters = {}
+        #for key in ['NSVE', 'NSVE_no_output', 'NSVEparticles', 'NSVEparticles_no_output', 'NSVEparticlesP2P']:
+        #    self.extra_parameters[key] = {}
+        #for key in ['NSVEparticles', 'NSVEparticles_no_output', 'NSVEparticlesP2P']:
+        #    self.extra_parameters[key].update(self.NSVEp_extra_parameters)
         return None
     def get_kspace(self):
         kspace = {}