diff --git a/src/pinefarm/external/integrability.py b/src/pinefarm/external/integrability.py
index fffea83..74502c3 100644
--- a/src/pinefarm/external/integrability.py
+++ b/src/pinefarm/external/integrability.py
@@ -59,6 +59,7 @@ def __init__(self, *args, **kwargs):
         self._q2 = np.power(self.theory["Q0"], 2)
         self._info = _IntegrabilityRuncard(**yaml_dict)
         self._evo2fl = evolution_to_flavour(self._info.flavour)
+        self.polarized = yaml_dict.get("polarized", "False")
 
     def run(self):
         """Empty function."""
@@ -78,6 +79,7 @@ def generate_pineappl(self):
         grid.set_key_value("initial_state_2", str(self._info.lepton_pid))
         grid.set_key_value("runcard", json.dumps(self._info.asdict()))
         grid.set_key_value("lumi_id_types", "pdg_mc_ids")
+        grid.set_key_value("polarized", self.polarized)
         # Fill grid with x*Tn
         # use subgrid because fill doesn't work?
         x = self._info.xgrid