diff --git a/themis/fields/vocabs.py b/themis/fields/vocabs.py
index 0527521..91e3a18 100644
--- a/themis/fields/vocabs.py
+++ b/themis/fields/vocabs.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+from zope import component
 from zope.browser.interfaces import ITerms
 from zope.interface import implements, classProvides
 from zope.schema.interfaces import ISource, IContextSourceBinder
@@ -11,6 +12,14 @@ from zope.schema.vocabulary import SimpleVocabulary, SimpleTerm
 
 from Products.CMFCore.utils import getToolByName
 
+from plone.registry.interfaces import IRegistry
+
+try:
+    from tabellio.config.interfaces import ITabellioSettings
+except ImportError:
+    ITabellioSettings = None
+
+
 class CommissionsSource(object):
     implements(IContextSourceBinder)
 
@@ -207,7 +216,20 @@ class LegislativeSessionsSource(object): # Legislative sessions
     implements(IContextSourceBinder)
 
     def __init__(self):
-        # XXX get this list from somewhere editable
+        self.terms = None
+
+    def _setup(self):
+        if self.terms:
+            return
+
+        if ITabellioSettings:
+            settings = component.getUtility(IRegistry).forInterface(ITabellioSettings, False)
+            sessions = settings.sessions
+            if sessions:
+                self.terms = [x.split(':')[1].strip() for x in sessions.splitlines() if x]
+                return
+
+        # fallback to an hardcoded list
         self.terms = [
                 u"2010 - 2011",
                 u"2009 - 2010",
@@ -237,6 +259,7 @@ class LegislativeSessionsSource(object): # Legislative sessions
                 ]
 
     def __call__(self, context):
+        self._setup()
         terms = [SimpleVocabulary.createTerm(x, x.encode('ascii', 'replace'), x) for x in self.terms]
         return SimpleVocabulary(terms)