diff --git a/pydocusign/models.py b/pydocusign/models.py
index 1e2b7cd..40fb0c3 100644
--- a/pydocusign/models.py
+++ b/pydocusign/models.py
@@ -396,7 +396,7 @@ class Envelope(DocuSignObject):
     attributes = ['documents', 'emailBlurb', 'emailSubject',
                   'eventNotification', 'recipients', 'templateId',
                   'templateRoles', 'status', 'envelopeId', 'userId',
-                  'enableWetSign']
+                  'enableWetSign', 'notification']
     required_attributes = ['envelopeId', 'userId']
     attribute_defaults = {
         'emailBlurb': '',
@@ -437,6 +437,8 @@ def to_dict(self):
         }
         if self.eventNotification:
             data['eventNotification'] = self.eventNotification.to_dict()
+        if self.notification:
+            data['notification'] = self.notification
         if self.templateId:
             data.update({
                 'templateId': self.templateId,
diff --git a/tests/test_models.py b/tests/test_models.py
index 0475433..ce82bdc 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -313,3 +313,31 @@ def test_void_method_calls_api(self):
         envelope.void('reason')
 
         client.void_envelope.assert_called_once_with('fake-envelope-id', 'reason')
+
+
+    def test_serialize_envelope_with_notification(self):
+        document = Document(
+            documentId=2,
+            name='document.pdf')
+        envelope = Envelope(
+            documents=[document],
+            emailBlurb='This is the email body',
+            emailSubject='This is the email subject',
+            status=ENVELOPE_STATUS_DRAFT,
+            notification={
+                'expirations': {
+                    'expireEnabled': True,
+                    'expireAfter': 365,
+                    'expireWarn': 5,
+                },
+            },
+        )
+        self.assertDictContainsSubset({
+            'notification': {
+                'expirations': {
+                    'expireEnabled': True,
+                    'expireAfter': 365,
+                    'expireWarn': 5,
+                },
+            },
+        }, envelope.to_dict())