--- a/doc/book/en/conf.py	Thu Aug 28 16:22:05 2014 +0200
+++ b/doc/book/en/conf.py	Thu Aug 28 18:46:41 2014 +0200
@@ -54,7 +54,7 @@
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = [
   'sphinx.ext.autodoc', 
-#  'sphinx.ext.viewcode',
+  'sphinx.ext.viewcode',
   'logilab.common.sphinx_ext',
   ]