diff --git a/src/calibre/ebooks/oeb/parse_utils.py b/src/calibre/ebooks/oeb/parse_utils.py
index a10d352d6d..3b50301a5b 100644
--- a/src/calibre/ebooks/oeb/parse_utils.py
+++ b/src/calibre/ebooks/oeb/parse_utils.py
@@ -80,7 +80,9 @@ def node_depth(node):
 
 def html5_parse(data, max_nesting_depth=100):
     import html5lib
+    # html5lib bug: http://code.google.com/p/html5lib/issues/detail?id=195
     data = re.sub(r'<\s*title\s*/\s*>', '<title></title>', data)
+
     data = html5lib.parse(data, treebuilder='lxml').getroot()
 
     # Check that the asinine HTML 5 algorithm did not result in a tree with