Add refcounting extension to build config.

diff --git a/Doc/conf.py b/Doc/conf.py
index 7a4c2713828313ff4ae733044de428a86bd33926..368ef7f6fe7f124fd189d2f58cd930356b3cded8 100644 (file)
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -13,6 +13,8 @@ sys.path.append('tools/sphinxext')
 # General configuration
 # ---------------------
 
+extensions = ['sphinx.addons.refcounting']
+
 # General substitutions.
 project = 'Python'
 copyright = '1990-%s, Python Software Foundation' % time.strftime('%Y')