diff --git a/offlineimap.conf b/offlineimap.conf
index 9d85377..3cd8dd5 100644
--- a/offlineimap.conf
+++ b/offlineimap.conf
@@ -15,8 +15,26 @@
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+# This file documents all possible options and can be quite scary.
 # Looking for a quick start?  Take a look at offlineimap.conf.minimal.
 
+# Settings support interpolation. This means values can contain python
+# format strings which refer to other values in the same section, or
+# values in a special DEFAULT section. This allows you for example to
+# use common settings for multiple accounts:
+#
+# [Repository Gmail1]
+# trashfolder: %(gmailtrashfolder)s
+#
+# [Repository Gmail2]
+# trashfolder: %(gmailtrashfolder)s
+#
+# [DEFAULT]
+# gmailtrashfolder = [Google Mail]/Papierkorb
+#
+# would set the trashfolder setting for your German gmail accounts.
+    
+
 
 ##################################################
 # General definitions
diff --git a/offlineimap/CustomConfig.py b/offlineimap/CustomConfig.py
index 0c10271..42132f8 100644
--- a/offlineimap/CustomConfig.py
+++ b/offlineimap/CustomConfig.py
@@ -15,11 +15,11 @@
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 
-from ConfigParser import ConfigParser
+from ConfigParser import SafeConfigParser
 from offlineimap.localeval import LocalEval
 import os
 
-class CustomConfigParser(ConfigParser):
+class CustomConfigParser(SafeConfigParser):
     def getdefault(self, section, option, default, *args, **kwargs):
         """Same as config.get, but returns the "default" option if there
         is no such option specified."""