=== modified file 'src/mailmanclient/_client.py'
--- src/mailmanclient/_client.py	2013-03-22 18:28:16 +0000
+++ src/mailmanclient/_client.py	2013-04-24 08:56:23 +0000
@@ -812,9 +812,10 @@
     def save(self):
         data = {}
         for key in self._preferences:
-            if self._preferences[key] is not None:
+            if self._preferences[key] is not None \
+                    and key not in ("http_etag", "self_link"):
                 data[key] = self._preferences[key]
-        response, content = self._connection.call(self._url, data, 'PUT')
+        response, content = self._connection.call(self._url, data, 'PATCH')
 
 
 LIST_READ_ONLY_ATTRS = ('bounces_address', 'created_at', 'digest_last_sent_at',

=== modified file 'src/mailmanclient/docs/using.txt'
--- src/mailmanclient/docs/using.txt	2013-03-22 18:28:16 +0000
+++ src/mailmanclient/docs/using.txt	2013-04-24 08:49:42 +0000
@@ -522,6 +522,12 @@
 
 Preferences can be set, but you have to call ``save`` to make your changes permanent.
 
+    >>> prefs = test_two.get_member('anna@example.com').preferences
+    >>> prefs['delivery_status'] = 'by_user'
+    >>> prefs.save()
+    >>> prefs = test_two.get_member('anna@example.com').preferences
+    >>> print prefs['delivery_status']
+    by_user
 
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