diff --git a/src/calibre/ebooks/mobi/writer.py b/src/calibre/ebooks/mobi/writer.py
index 51639ac757..404fdddff2 100644
--- a/src/calibre/ebooks/mobi/writer.py
+++ b/src/calibre/ebooks/mobi/writer.py
@@ -1,5 +1,6 @@
 '''
 Write content to Mobipocket books.
+Foo
 '''
 
 __license__   = 'GPL v3'