diff --git a/src/calibre/ebooks/mobi/writer.py b/src/calibre/ebooks/mobi/writer.py
index 886d60e679..0c4f54c25c 100644
--- a/src/calibre/ebooks/mobi/writer.py
+++ b/src/calibre/ebooks/mobi/writer.py
@@ -141,7 +141,7 @@ def rescale_image(data, maxsizeb, dimen=None):
         scale -= 0.05
     return data
 
-class Serializer(object):
+class Serializer(object): # {{{
     NSRMAP = {'': None, XML_NS: 'xml', XHTML_NS: '', MBP_NS: 'mbp'}
 
     def __init__(self, oeb, images, write_page_breaks_after_item=True):
@@ -312,6 +312,8 @@ class Serializer(object):
                     buffer.seek(hoff)
                     buffer.write('%010d' % ioff)
 
+    # }}}
+
 class MobiWriter(object):
     COLLAPSE_RE = re.compile(r'[ \t\r\n\v]+')