diff --git a/src/msspec/parameters.py b/src/msspec/parameters.py
index 8a682f4..3b4b40c 100644
--- a/src/msspec/parameters.py
+++ b/src/msspec/parameters.py
@@ -19,8 +19,8 @@
 # along with this msspec.  If not, see <http://www.gnu.org/licenses/>.
 #
 # Source file  : src/msspec/parameters.py
-# Last modified: Mon, 27 Sep 2021 17:49:48 +0200
-# Committed by : sylvain tricot <sylvain.tricot@univ-rennes1.fr>
+# Last modified: Tue, 15 Feb 2022 15:37:28 +0100
+# Committed by : Sylvain Tricot <sylvain.tricot@univ-rennes1.fr>
 
 
 """
@@ -839,6 +839,17 @@ class GlobalParameters(BaseParameters):
         self.phagen_parameters.calctype = phagen_calctype
         self.spec_parameters.calctype_spectro = spec_calctype
 
+    def bind_polarization(self, p):
+        if p.value is None:
+            ipol = 0
+        elif p.value == 'linear_qOz':
+            ipol = 1
+        elif p.value == 'linear_xOy':
+            ipol = -1
+        elif p.value == 'circular':
+            ipol = 2
+        self.spec_parameters.calctype_ipol = ipol
+
     def bind_spinpol(self, p):
         if p.value == True:
             LOGGER.error('Spin polarization is not yet enabled in the Python version.')