diff -r f58b41f6708b -r 091306562855 mercurial/config.py
--- a/mercurial/config.py	Wed Aug 13 17:05:48 2014 -0400
+++ b/mercurial/config.py	Sun Aug 24 19:45:46 2014 -0400
@@ -31,7 +31,15 @@
 
     'global':
 """# example system-wide hg config (see "hg help config" for more info)
-""",
+
+[extensions]
+# Uncomment these lines for some possible extensions
+# (see "hg help extensions" for more info)
+#
+# blackbox =
+# progress =
+# color =
+# pager =""",
 }
 
 class config(object):